Voter Registration in Colorado

Attention: Voter information and identification requirements may change prior to an election. Please check with the Secretary of State's website to make sure you have the most current information.

The Colorado Department of State (DOS) provides several ways to register to vote, including online registration.

Colorado residents can also register to vote by mail, email, fax, or in person at various locations throughout the state, including the Colorado Department of Revenue - Division of Motor Vehicles (DMV).

Voter Eligibility in Colorado

In order to register to vote in Colorado, you must be:

  • A United States citizen.
  • A Colorado resident who has lived in the state for at least 22 days before the election in which you plan to vote.
  • At least 18 years old by the date of the next election.

You CANNOT vote if you are currently serving a sentence of confinement for a felony.A law change allows you the right to register to vote once you have completed your period of incarceration. Anyone in jail awaiting trial, may also register to vote and vote.

Register to Vote in Colorado

Colorado residents can register to vote:

  • Online.
    • Only if you have a CO driver's license or ID card issued by the Colorado DMV.
  • By mail, by fax, or by email.
  • In person.


To register to vote online, you MUST have either:

  • A valid Colorado driver's license.
  • A Colorado ID card issued by the DMV.

The state requires your driver's license or ID card number for verification before you can proceed with the rest of the online registration process. 

Just Moved?

Find all the information you need to finish your moving requirements with the DMV.

By Mail, Fax, or E-mail

For any of the above methods, submit the Colorado Voter Registration Form (Form 100) to your county clerk's office. You can also pick up this form directly from your county clerk's.

In Person

You can register to vote in person at:

  • Your county clerk's office.
  • A CO DMV office when you apply for or renew your driver's license.
  • Public assistance offices.
  • Military recruitment offices.
  • Voter service and polling centers.

After you register to vote you can verify your registration online.

Military, Overseas & Out-of-State CO Voters

Members of the military, Colorado residents living overseas, and out-of-state college students can also register to vote in Colorado.

Military & Overseas Voter Registration

If you are a Colorado citizen in the military or living overseas, you can register to vote using:

NOTE: If you are an overseas voter, provide both your residential CO address AND your current overseas mailing address.

Deadlines and Ballots

You can register until and including the date of the election.

However, if you are requesting a ballot by mail, your registration form must be received by close on the 7th day before the election.

NOTE: You can also receive your ballot by fax or email. To receive your ballot by fax, you'll need to give a fax number to your county elections office and include the international prefix and country code.

To request a ballot by email, you'll need to provide an e-mail address where the ballot can be sent.

If you would like to change your party affiliation you can use the CO Find My Voter Registration online system.

Out-of-State Residents

Out-of-state residents who maintain their permanent residence in Colorado can register to vote online, by mail, by fax, or by email. Please see Register to Vote in Colorado above to learn how.

College Students

If you are a college student from Colorado, you can choose where to register to vote:

  • From your permanent home address.
  • In the county and/or state where you attend school.

You CANNOT register to vote in more than one location.

Deadlines to Register to Vote in CO

Colorado voter registration deadlines are based on the registration method. You can register:

  • At a voter registration drive: Until 22 days before the election.
  • Online or by mail: At least 8 days prior to the election.
  • At a voter service and polling center: Up to and including Election Day.

Remember, when you go to vote, bring a current proof of ID.

Change Your CO Voter Registration

If you move or change your name or want to change your party affiliation, you must to update your Colorado voter registration information.

Address Changes

When you move to a new address, you can update your voter registration in several ways:

If you need to change your address close to or on Election Day, you can do so in person at a voter service and polling center.

Name Changes

To change your name on your voter registration, you must submit the Voter Registration Form (Form 100) to your county clerk

See Register to Vote in Colorado above.

Party Affiliation Changes

If you wish to change your party affiliation you can go to the Secretary of State website.

CO Voter Registration Card

You can access and print your voter record from the Go Vote Colorado website.

For a copy of your certificate of registration, contact your county clerk's office.


Voter Registration and Absentee Ballot Request Federal Post Card Application
If you're a U.S. citizen living out of your voting jurisdiction, use this form to register to vote AND/OR request an absentee ballot.
Voter Registration
Application to register to vote in Colorado.
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