Colorado Election Security

Colorado Election Safeguards

The layers of protection behind every election.

Colorado elections are secured, checked, and verified at every stage. Paper ballots, public testing, documented controls, and post-election audits provide evidence that does not depend on trusting one person or one machine.

Paper evidence Bipartisan teamwork Separation of duties Public transparency Independent verification

Security that follows the ballot

Election security begins well before a ballot is issued and continues after results are certified. Select a stage below to see the safeguards in place, how the work is checked, and what evidence remains available for review.

How the layers work together If one safeguard does not work as intended, another layer is positioned to prevent, detect, document, or correct the problem. No single technical claim can be evaluated in isolation from the paper ballots, reconciliation records, access controls, observers, audits, and certification process around it.

You have a role, too

Voters are part of election integrity

State and county election officials build and operate the safeguards. Voters help those safeguards work by keeping their information current, following their ballot, planning ahead and contacting their county clerk when something does not look right.

Keep your voter registration up to date

Check your registration, update your address and find official election information at GoVoteColorado.gov.

Make a plan to vote

Decide whether you will use a drop box, return your ballot by mail or vote in person. Your ballot must be received by 7 p.m. on Election Day. Find voting locations and options.

Let your county know about a ballot that is not yours

If you receive a ballot for someone who no longer lives at your address, do not open it. Contact your county clerk so the voter record can be reviewed. Find your county clerk.

Get involved in elections

Elections run because community members serve as election judges and in other paid or volunteer roles. You will learn how elections work by taking part. Ask your county clerk about opportunities.

Make your county clerk your trusted source

Your county clerk is the local expert on the processes, systems and equipment used in your county. When you have a question or hear a claim, go directly to your clerk.

What Colorado voters told researchers

The strongest confidence-builders are safeguards people can understand and verify

In a statewide survey, the three protections most likely to increase confidence were post-election audits, voting-system testing, and paper ballots. Fewer than half of respondents already knew Colorado used each protection. That makes clear explanations and visible evidence especially important.

71%

Post-election audits

Said knowing Colorado audits ballots after every election made the system feel more secure.

Already aware41%
71%

Voting-system testing

Said knowing every voting system is tested before use made the system feel more secure.

Already aware44%
69%

Paper ballots and a paper trail

Said knowing paper ballots are securely retained for audits and recounts made the system feel more secure.

Already aware39%

Source: Colorado Department of State statewide online survey of 1,010 Colorado adults, conducted May 2021. Percentages describe respondents who said learning about each safeguard would make them feel much more or somewhat more secure.

Elections are a community effort

No one person or political party controls the election

Colorado elections are not conducted by a single official or a faceless system. County election officials are joined by bipartisan and multipartisan teams of trained election judges who perform or review many of the most sensitive ballot-handling, verification, audit, and certification activities.

These election judges are your friends and neighbors. They are church members, PTA members, soccer moms and dads, retirees, students, veterans, and working people from across the community. It takes a whole community, representing different backgrounds and political views, to conduct an election.
Shared responsibilitySensitive work is divided among trained people with assigned roles, so one person cannot secretly control the process.
Witnessed and documentedBallot transfers, processing decisions, and other critical actions are observed, recorded, or subject to review.
Different political perspectivesPeople affiliated with different parties work side by side under the same written standards.
Independent checksParty representatives, public observers, audit boards, and canvass boards add further layers of oversight.

The election lifecycle

Explore each layer

The categories follow the election from voter registration through certification and records retention.

Present at every stage

Five protections that run through the entire election

These safeguards do not belong to a single step. Open each layer to see the individual security measures and the election processes they protect.

People and proceduresTrained teams, divided responsibilities, and documented standards reduce reliance on any single person.

Election judges are members of the community who bring different backgrounds and political perspectives to the same work. Many sensitive activities are performed or reviewed by bipartisan teams under written procedures.

  • Bipartisan and multipartisan election judges
  • Separation of duties and assigned roles
  • Background checks for personnel with sensitive access
  • Election-official certification and recurring training
  • Written signature-verification, voter-intent, duplication, and adjudication standards
  • Bipartisan canvass boards and state oversight
RegistrationVotingBallot returnProcessingTabulationAudit
Physical securityControlled spaces, documented transfers, and continuous records protect ballots and equipment.
  • Restricted and credentialed access to secure areas
  • Tamper-evident seals and equipment inventories
  • Continuous video monitoring where required
  • Secure, anchored ballot drop boxes
  • Bipartisan ballot retrieval and controlled transport
  • Chain-of-custody and batch-transfer records
  • Regular third-party physical security assessments
Mail productionIn-person votingDrop boxesProcessingTabulationStorage
Cybersecurity and system controlsCertified technology, network isolation, access controls, and monitoring protect election systems and data.
  • Federally tested and state-certified voting systems
  • Trusted builds and software-version verification
  • Voting systems isolated from the internet and external networks
  • Role-based access and system activity logs
  • Controlled, documented transfer of unofficial results
  • Vulnerability scanning, phishing-resistance testing, and cyber-hygiene reviews
  • Secure backups and incident-response procedures
RegistrationSystem prepVotingTabulationReporting
Transparency and independent verificationPaper evidence, observation, public testing, and independent checks make results reviewable.
  • Voter-verifiable paper ballots
  • Public logic-and-accuracy testing with known test votes
  • Political-party and public observation
  • Ballot tracking and voter-facing status information
  • Open records, ballot images, cast-vote records, and published reports
  • Risk-limiting audits, signature-verification audits, and recount procedures
  • Separation of the public reporting website from the voting system
System prepMail votingProcessingTabulationReportingAudit
Continuity, reconciliation, and recoveryRedundant records and recovery procedures allow work to continue and specific concerns to be tested.
  • Ballot accounting and reconciliation at every transfer
  • Original ballots linked with duplicates and adjudication records
  • Retention of paper ballots, logs, video, reports, and system records
  • Continuity plans for cyber incidents, power outages, emergencies, and facility disruptions
  • Secure backups and documented recovery procedures
  • Canvass, certification, recount, and election-contest remedies
  • Authoritative data matching and list-maintenance review
Every processCanvassCertificationInvestigation

Election-night context

What election-night results mean

Election-night results are unofficial

Counties continue processing eligible ballots after Election Day, and reported totals may change as verified ballots are added. Audits, reconciliation, and bipartisan canvass take place before results are certified.

What to expect on Election Night and after

You do not have to take our word for it

See the evidence for yourself

Trust grows when voters can check their own information, follow their ballot, observe election work, and compare reported results with independent records.

Start with your own voter record

Visit GoVoteColorado.gov to confirm that you are registered and that your information is current. You can also update your voter record and check the status of your mail ballot.

Check your voter record

Track your ballot

Receive status updates as your ballot is mailed, received, accepted, and prepared for counting. If there is a signature issue, the county provides an opportunity to cure it.

Open Colorado BallotTrax

Observe the process

Political parties, candidates, issue committees, and other authorized watchers may observe key election activities under Colorado law.

Learn about election watchers

Review the audit

Colorado publishes information about the risk-limiting audit that compares randomly selected paper ballots with the voting system's records.

Visit the Colorado Audit Center

Ask your county

Your county clerk can explain local procedures, observation opportunities, public testing, ballot tracking, results updates, and retained records.

Find your county election office

Rumor vs. reality

Let's separate fact from fiction.

You've probably heard claims about Colorado elections that leave out important safeguards, records, or context. Read the question, then select Show the facts for the evidence and fuller story. Your county Clerk and Recorder remains your trusted source for election information.

Do Colorado voters reject mail ballots? No. Colorado voters overwhelmingly choose to cast the mail ballots sent to them.

A 2024 statewide exit poll asked voters about Colorado's current system, where voters receive a ballot in the mail and may return it by mail or drop box or vote in person at a voter service center. Eighty-seven percent said they were satisfied, including 72% of Republicans, 87% of unaffiliated voters, and 99% of Democrats.

CCCA's review of statewide ballot-return data shows that since Colorado began sending a mail ballot to every active registered voter, well over 90% of participating voters in coordinated, primary, and general elections have cast the ballot mailed to them. That includes the vast majority of Democratic, Republican, unaffiliated, and minor-party voters.

Colorado voters make that choice even though in-person voting remains readily available. Voter service and polling centers open before Election Day, and voters may visit any center in their county rather than being limited to one assigned polling place. For general elections, minimum locations begin opening 15 days before Election Day; primary and November coordinated elections have minimum locations beginning eight days before Election Day.

The clearest evidence is voter behavior: across party affiliations and election types, Coloradans overwhelmingly use their mail ballots. Ballots may be returned by mail, deposited in a secure drop box, or delivered to a voter service center. Voters who prefer may instead vote in person.

Review the Colorado Polling Institute findings, Colorado's official election-results archive, and Colorado Election Rule 7.

Does Colorado have poorly maintained voter registration lists? No. No voter list can be 100% current every moment, but Colorado continuously updates its records using state, federal, interstate, postal, and local information.

Voter registration lists are not static. Every day, people move, change their names, update identification records, die, become incarcerated for a felony conviction, complete their sentences, or register in another state. No statewide voter list can reflect every life change instantaneously. The meaningful question is whether the state uses reliable information frequently, applies consistent matching standards, and follows up when records may need to be updated. Colorado does.

18/21Heritage score

Even a leading conservative organization gives Colorado high marks

The Heritage Foundation, which describes its mission as promoting conservative public policy, awards Colorado 18 of 21 points for the Accuracy of Voter Registration Lists.

Heritage gives Colorado credit for comparisons with DMV, corrections, state vital-records, and Social Security death data; residential-address review; USPS change-of-address information; multistate comparisons; reporting; and public access to voter lists.

The three points not awarded concern comparisons with public-assistance agencies, use of commercial data such as credit-agency information, and a requirement involving federal jury records. Review Heritage's Colorado scorecard.

How often are the records checked? Colorado's list-maintenance work occurs throughout the year on different schedules depending on how frequently each authoritative source provides information.

Daily or near-daily work

  • Voter-initiated changes and updates: Voters submit new registrations and changes to their registration information daily, including address, name, and party-affiliation updates. These submissions are part of ongoing voter-list maintenance.
  • Colorado Department of Revenue: A nightly file of new and updated driver's-license and state-ID information supports automatic voter registration for eligible citizens and voter-address updates.
  • SCORE duplicate reports: Counties research and consolidate records created by name variations, name changes, or data-entry issues.
  • Other states: Notices that a voter has registered elsewhere are reviewed and acted upon when Colorado's legal matching requirements are satisfied.
  • Local death information: Counties may review death certificates, family affidavits, obituaries, and other reliable information under established matching standards.

Monthly and periodic checks

  • Colorado Department of Corrections: Each month, the department provides the Secretary of State with information about people currently incarcerated for felony convictions. Counties use this information to update registrations under applicable legal requirements.
  • Undeliverable mail and ballots: Counties review election mail and ballot packets returned as undeliverable throughout the year, including during and after each election. Returned items help identify registration records that need address review and follow-up. Counties process any status changes and required notices according to applicable legal requirements and election-related timing rules.
  • National Change of Address: The Secretary of State provides USPS NCOA data to counties by the fifth business day of each month when the file is received on time. Counties process updates and required notices by the end of the month.
  • Death records: Colorado Department of Public Health and Environment data and Social Security death information help identify voters who may be deceased. State death information may be provided more frequently near an election.
  • HAVA identification checks: Counties process verification files at least monthly to check identification numbers provided at registration.
  • AAMVA matching: Colorado attempts to associate a Colorado driver's license or state ID with records that contain a Social Security number but lack a Colorado credential.
  • ERIC comparisons: Member data is submitted at least every 60 days. Colorado uses the resulting reports identifying possible in-state moves, cross-state moves, duplicate registrations, and deceased voters as one matching tool. ERIC does not change SCORE records or replace authoritative DMV, death, NCOA, or incarceration data.
  • Citizenship-related review: In appropriate cases, Colorado may use official state information and the federal SAVE system to determine whether a person previously issued a noncitizen credential later became a citizen.
  • Other government and local information: NVRA agencies transmit registration information to SCORE, and some counties use assessor or GIS data when researching residential addresses.

After general elections

Records previously marked inactive because of returned mail, an undeliverable ballot, or NCOA information receive a forwardable confirmation notice. If the voter does not respond and does not vote in two consecutive general elections, the registration is canceled as required by state and federal law.

Safeguards for eligible voters

A potential match is not an automatic cancellation. Counties must apply legal matching criteria, research conflicting information, provide required notices, and preserve the registration record and its history. Records are not simply deleted from SCORE. They may move to inactive or canceled status, remain available for audit, and may be reactivated when permitted by law.

The bottom line: No voter list is perfect, but Colorado performs list maintenance continuously and uses multiple independent sources to identify records that may need attention. The state updates or cancels registrations only when the evidence and legal criteria support the action while protecting eligible voters from being improperly removed.

Review Colorado Election Rule 2, Colorado's election laws, and how ERIC produces list-maintenance reports. See also Douglas County’s voter-list maintenance guide.

Can someone register to vote using any Colorado address? No. A voter must establish a Colorado residence, provide identifying information, and affirm under penalty of perjury that the registration is truthful.

Colorado requires a voter to be a United States citizen, meet the state's residency requirement, provide a Colorado residential address, and affirm that the information on the application is true. A false registration is illegal. Election officials also review registration information using government records, identification checks, returned mail, address updates, duplicate reports, and other list-maintenance information.

Online registration requires a government identifier

Colorado's online registration system requires a valid Social Security number, Colorado driver's license, or Colorado identification card. A student ID by itself is not a credential for registering through the online system.

Unverified information requires follow-up

If the identifying information submitted with a new registration cannot be verified, the record may be marked “ID required.” The voter must then provide acceptable identification before the ballot can be counted.

Residence and mailing address are different

The residential address determines the voter's precinct and ballot. A separate mailing address only tells election officials where to send election mail. Colorado voters who are temporarily away for school, work, military service, medical care, travel, or family obligations may lawfully receive mail somewhere other than their voting residence.

Voters without a conventional address retain the right to vote

A voter without a fixed home must identify the Colorado location to which the voter regularly returns. That location is used to determine the correct precinct and ballot. A separate address may be provided for receiving mail. This accommodates eligible voters who are unhoused; it does not eliminate the residency requirement.

The bottom line: Entering an address on a form does not make someone eligible. Eligibility comes from citizenship, Colorado residence, identity information, a sworn affirmation, and the verification and follow-up processes required by law.

Review Colorado's online registration requirements, see the Colorado voter-registration form, and review Colorado Election Rule 2.

Does Colorado allow noncitizens to vote? No. Only United States citizens may register and vote in Colorado elections.

Colorado's voter-registration application asks whether the applicant is a United States citizen and requires the applicant to affirm eligibility under penalty of perjury. Records received through Colorado's automatic voter-registration process must be supported by documentation demonstrating United States citizenship.

Colorado also conducts citizenship-related checks each month as part of its year-round voter-list maintenance. The process uses official state records, including information from the Colorado Department of Revenue, and, when available and legally authorized, federal information through the Systematic Alien Verification for Entitlements program, known as SAVE. Potential discrepancies are reviewed by election officials; a database indication is not treated as an automatic determination without verifying the person's identity and current status and following the required notice and due-process procedures.

~4 millionactive registered voters in SCORE
~3.996 millionwith a Colorado driver license, state ID, or Social Security number on file
99.9%of active voter records have at least one of these identifiers

Why the identifiers matter: They help election officials match voter records with authoritative government information and distinguish one person from another. An identifier is a record-matching tool, not by itself proof of citizenship. The approximately 4,000 active records without one of these identifiers still belong to real registered voters, and counties maintain the documentation supporting their registrations. Figures are approximate.

Review Colorado's election laws and learn more about Colorado's citizenship and list-maintenance checks.

Why does Colorado participate in ERIC? It helps election officials identify outdated and potentially duplicate records while Colorado retains control over every voter-record decision.

The Electronic Registration Information Center helps states spot voter records that may be outdated or inaccurate by securely comparing official data across participating states. Colorado was one of the bipartisan group of seven states that created ERIC in 2012.

01Cross-state movers

Finds voters who appear to have moved from one member state to another.

02In-state updates

Finds newer address or contact information in motor-vehicle records.

03Duplicate records

Flags registrations in the same state that may belong to the same person.

04Deceased voters

Compares voter records with official Social Security death data.

ERIC provides leads. Election officials verify and act.

Step 1States send protected data
Step 2ERIC compares official records
Step 3Possible matches are returned
Step 4Officials validate under law
Key guardrail: ERIC is never connected to Colorado's voter registration system and cannot add, remove, or change a voter record. Colorado retains control of its voter rolls, verifies the information ERIC provides, and follows federal and state law before updating a record. Sensitive identifiers are cryptographically hashed before transmission, and member states cannot see one another's data or reports.

ERIC also produces voter-participation reports that can flag possible voting in more than one member state or on behalf of a deceased voter. Those are leads, not findings of guilt. Election officials review the underlying records and refer credible cases to law enforcement. Colorado rules also require counties that receive interstate information indicating possible voting in more than one jurisdiction to send the information to the Secretary of State for possible investigation and prosecution. Since 2013, ERIC reports have identified millions of potentially outdated records for member states. Read ERIC's FAQ, security overview, published statistics, and Colorado Election Rule 2.

How are military and overseas ballots protected? Military and overseas voters must meet legal eligibility requirements, affirm their status, and follow special procedures designed for citizens serving or living away from home.

Federal and Colorado law protect the voting rights of eligible military members, their families, and United States citizens living overseas. These voters are commonly called UOCAVA voters. An international mailing address alone does not create UOCAVA eligibility and does not establish a Colorado voting residence.

Eligibility and residence still matter

A covered voter must affirm eligibility and provide the applicable Colorado voting residence. A voter temporarily living elsewhere uses the Colorado residence that establishes eligibility, while a separate mailing address identifies where election materials should be delivered. Federal and Colorado law also provide a residence rule for certain United States citizens born abroad who have never lived in the country, based on the last Colorado residence of a qualifying parent, legal guardian, spouse, or civil-union partner.

Status and addresses are reviewed

Colorado requires election officials to contact covered voters before elections to provide an opportunity to confirm their status and update their residential and mailing addresses. Undeliverable correspondence may cause a record to become inactive, and Colorado rules provide procedures for removing covered-voter status when the facts no longer support it.

Electronic return is a limited accommodation

Covered voters may request electronic ballot delivery and, under Colorado's special rules, may return a ballot electronically when they reasonably determine that a more secure return method, such as mail, is not available or feasible. Electronic return requires a signed affirmation and means the voter must waive ballot secrecy.

Partisan assumptions are not evidence

Military members and overseas citizens do not vote as a single political bloc. An unexpected partisan pattern is not proof that ballots were altered, added, or stolen. Eligibility, voter affirmations, ballot records, reconciliation, and the evidence supporting the count must be examined instead.

The bottom line: These procedures make voting possible for eligible citizens who may be thousands of miles from home while preserving documentation, eligibility checks, ballot accounting, and legal accountability.

Review Colorado's military and overseas voter FAQs and Colorado Election Rule 16.

Did Judicial Watch's lawsuit cause Colorado to cancel 372,000 voter records? No. The figure reflects routine cancellations under Colorado's existing list-maintenance process, not a court-ordered cleanup or a new process created by the settlement.

Judicial Watch says its lawsuit “caused” Colorado to remove 372,000 registrations after the parties settled. The timing alone does not establish that claim. The annual data show large-scale cancellations before the 2023 settlement, during the settlement year, and after the settlement. That pattern is consistent with an ongoing, legally required process, not a one-time cleanup caused by litigation.

What happened in the case: Judicial Watch filed its lawsuit in October 2020, alleging that Colorado had violated federal list-maintenance requirements. The parties settled in March 2023. Colorado denied that it had violated federal law, and the settlement did not require the state to overhaul or change its voter-list maintenance procedures. Colorado agreed to continue providing Judicial Watch with voter-registration and list-maintenance data that was already largely maintained through standard public reporting.

No admission of wrongdoing

Colorado denied Judicial Watch's allegations and did not admit that its existing practices violated federal law.

No court-ordered overhaul

The settlement did not order Colorado to create a new cleanup program or change its established list-maintenance operations.

Continued data reporting

Colorado agreed to provide voter-registration and federal list-maintenance survey data on a continuing basis.

Existing law remained in place

Counties and the state continued applying the same federal and state matching, notice, waiting-period, and cancellation requirements.

Large-scale cancellations occurred before, during, and after the 2023 settlement:

2021247,233during litigation; before settlement
202290,176before settlement
2023253,872settlement year
202481,938after settlement
2025298,849after settlement
202625,436partial-year figure

Source: Colorado voter-registration cancellation data compiled for the CCCA analysis. The 2026 number is a partial-year figure.

Year-to-year totals vary because many address-related cancellations occur only after required notices, waiting periods, and two consecutive general elections without voter activity. A canceled registration also is not evidence that anyone voted illegally. It means the record met the legal criteria for cancellation.

The bottom line: The pattern predates the settlement and continues after it. Judicial Watch is taking credit for work Colorado election officials were already required to perform and had been performing for years. The settlement increased the information supplied to Judicial Watch; it did not create Colorado's list-maintenance program or direct the cancellation of 372,000 records.

Read Judicial Watch's claim, review reporting on what the settlement required, and review Colorado Election Rule 2.

Do we need paper ballots? Yes. Colorado already votes on paper.

Whether a voter marks a ballot by hand or uses an accessible ballot-marking device, the vote is recorded on a paper ballot the voter can review. Counties preserve those ballots, and bipartisan audit boards compare selected paper ballots with the voting system's records. The paper remains independent evidence for audits and recounts.

See how Colorado's paper-ballot audit works.

Are voting systems connected to the internet? No. Colorado's voting systems are prohibited from connecting to the internet.

Colorado rules require the voting system to be isolated from the internet and from other external networks. Wireless capability must be disabled. Unofficial results are moved to a separate reporting system under documented procedures; the public election-results website is not the system that reads and tabulates ballots.

Security does not depend on trusting a machine or its manufacturer

A claim about where a component was manufactured, who once worked on software, or what someone demonstrated on a different computer does not establish that a certified Colorado voting system was compromised or that a vote was changed. A meaningful claim must be supported by evidence showing that the equipment used in an actual election was affected and that the safeguards and independent records failed to detect it.

Colorado verifies the approved election software and configuration, conducts public logic-and-accuracy testing, restricts physical and administrative access, documents the movement of election data, reconciles ballot quantities, and preserves voter-verifiable paper ballots. After the election, bipartisan audit boards compare randomly selected paper ballots with the voting system's records during the risk-limiting audit.

The paper ballots provide an independent test of the electronic count. If software secretly changed reported votes, the electronic records would not agree with the voter-marked paper ballots examined during the audit. The audit can expand when the evidence does not provide the required confidence in the reported outcome.

Review Colorado Election Rule 20, learn how the paper-ballot audit works, and review the federal testing and certification program.

Why not count every ballot entirely by hand? A controlled Mohave County test produced a 5.41% error rate. At El Paso County's 2020 scale, that would affect approximately 20,731 ballots.

Hand review is an important verification tool. Colorado uses bipartisan teams to inspect selected paper ballots during its risk-limiting audit. But using people to tally every contest on every ballot is a different task. At election scale, a full hand tally adds time, repeated handling, staffing demands, reconciliation work, and opportunities for ordinary human error.

Hand audits and full hand tabulation are not the same thing.

A well-designed audit uses hand examination of paper ballots to test whether the reported outcome is correct. Full hand tabulation replaces the initial count with a manual tally of every vote position, including dozens of contests on each ballot.

2,000registered voters
80%illustrative turnout
40contests per ballot
64,000vote positions to examine

Mohave County test: a small count under controlled conditions

In June 2023, Mohave County, Arizona tested full hand tabulation using experienced election workers and ballots whose correct totals were already known through repeated logic-and-accuracy testing.

850test ballots
~36contests per ballot
7experienced workers
3 daysto complete the test
5.41%observed error rate

The hand count produced 46 errors among 850 test ballots, an observed error rate of 5.41%. The county reported errors that included calling the wrong candidate, missing votes, double-marking or skipping tally marks, illegible tallying, and watchers losing focus because of fatigue or boredom. These errors were identifiable because the test ballots had known totals. Mohave County later projected that full hand counting in the 2024 election would cost more than $1.1 million.

20,731

What would that rate look like at Colorado scale?
Applying the same 5.41% rate to the 383,204 ballots cast in El Paso County's 2020 General Election would equate to counting issues affecting approximately 20,731 ballots. This is a scale illustration, not a claim that El Paso County's ballots were miscounted.

What this demonstrates: Even a small, planned exercise with experienced personnel produced mistakes that the counting team did not catch. A live general election would add more ballots, ballot styles, write-ins, staffing, custody documentation, public observation, and deadline pressure. Read the NBC News report or review the Mohave County report.

What a Colorado precinct could look like

Consider a precinct with 2,000 registered voters and 80% turnout. That produces 1,600 ballots. With 40 contests on the ballot, election judges could have as many as 64,000 individual vote positions to interpret, tally, compare, and reconcile.

Those judges may already have worked a 14- to 15-hour day operating the polling location before counting could even begin, potentially as late as 10 or 11 p.m. Fatigue, repeated handling, tally disagreements, and recounts would increase the risk of ordinary human error and weaken chain-of-custody controls.

Full hand tabulation is not practical. It is slower, less accurate, and less secure than Colorado's centralized, audited tabulation process.

People must repeat and reconcile the count

When tally teams disagree, ballots must be reviewed and totals counted again. The U.S. Election Assistance Commission now provides a Hand Count Workload Calculator based on observations from real U.S. elections to help jurisdictions estimate the teams and time required.

Real-world tests have produced discrepancies

During Nye County, Nevada's 2022 parallel hand-count effort, the county clerk estimated that the first day's hand tally differed from the machine tally by nearly 25%, attributing the difference to human counting error. The count also required repeated recounts when tallies did not match. Read the Associated Press report.

More handling creates more controls to manage

A full manual tally requires more counting teams, workspaces, ballot transfers, tally sheets, observers, custody records, and reconciliation steps. Central counting allows those activities to occur in a controlled facility with standardized procedures and retained records.

Colorado's approach combines speed with independent verification: certified tabulation systems produce the initial count, paper ballots preserve the voter-verifiable record, and bipartisan risk-limiting audit boards compare sampled ballots with the system's records. If discrepancies reduce confidence in the outcome, the audit examines additional ballots. Learn how Colorado's risk-limiting audit works.
Did the Mesa Reports prove election fraud? No. They did not show that votes were changed in Mesa County's 2020 or 2021 elections.

The CCCA's review concludes that the Mesa Reports present a distorted and incomplete picture of Colorado's elections. By focusing on technical details without the operational and legal context needed to interpret them, the reports mischaracterize lawful procedures and ordinary system functions. They do not establish election fraud or misconduct.

Colorado elections use multiple, overlapping safeguards designed to prevent, detect, document, and correct problems. The facts addressed in the CCCA review are clear:

  • No election records were destroyed.
  • No uncertified voting systems were used.
  • No part of the voting system was connected to the internet.
  • No unauthorized databases were created.
  • All ballots were properly accounted for.
  • No election-results reports were created illegally.
  • The elections examined in Mesa County were accurate and secure.

During the period addressed by the Mesa Reports, the proven criminal conduct was the election-system security breach committed by former Clerk Tina Peters, as determined by a Mesa County jury. It was not misconduct by the election systems or by staff following lawful procedures.

Read the district attorney investigation summary and the full CCCA Mesa County report.

Was there a problem with Arapahoe County's 2020 election? No. A later public transparency file contained a formatting error, but the election and official records were accurate.

Arapahoe County's 2020 General Election was accurately counted, audited, canvassed, and certified. The original, unredacted cast vote record used for the risk-limiting audit and certification remained intact and unchanged. No ballots, votes, or official results were altered.

There was an issue with a separate, publicly posted redacted copy of the cast vote record. That file was created on December 10, 2020, after the election had already been audited and certified. An Excel row misalignment during the redaction or file-transfer process scrambled some data relationships in that public copy. The problem was identified later, reviewed, and a corrected redacted file was posted on April 2, 2025.

The distinction matters: An error in a transparency copy is not an error in the election. The paper ballots, official cast vote record, audit evidence, certified totals, and retained election records independently confirm the outcome.

Read the full CCCA analysis of the Arapahoe County CVR.

Colorado election results are supported by paper ballots, documented procedures, bipartisan oversight, reconciliation, audits, and certification.
Sources and further reading