Registration Requirements & Information

Registration Requirements & Information

A registered voter in Colorado is considered a resident of Colorado for income tax and motor vehicle registration and operation.


Meeting the following criteria is required to register to vote in Colorado:

  • Be a U.S. citizen
  • Be 16 years old to preregister to vote
  • Be 17 years old and turning 18 years old on or before the date of the next general election to be eligible to vote in a primary election
  • Be 18 years old to vote in all other elections
  • Be a Colorado resident for at least 22 days before the election
  • Must not be serving a sentence of confinement or detention for a felony conviction

Voter Identification

While you do not need to have a Colorado ID, CO Driver’s License or other form of acceptable ID in order to register, you must produce this documentation the first time you vote. Thus, it is recommended to provide this documentation during the registration process to avoid needing to mail in a form of identification when you vote. Visit the Secretary of State list of Acceptable Forms of Identification.

Last Day to Register to Vote

If you meet the voter registration requirements (above), you may register to vote up to and including Election Day. However, in order to receive a ballot in the mail, the Boulder County Clerk & Recorder office must receive your voter registration no later than 8 days before the election. If you register after this time, you must visit a Voter Service & Polling Centers to vote.

Traveling during the election

All Colorado voters receive their ballot in the mail (unless they register less than 8 days before an election) and mail ballots will not be forwarded by the United States Postal Service. If you need your ballot sent to a location other than your voter registration address, then you must contact our office as soon as possible to request an absentee ballot application. If you are changing your mailing address online through the voter registration system, you must do so no later than 8 days before an election in order to receive a ballot in the mail. Remember to update your mailing address after you have returned from your trip.

More information on Voter Registration in Colorado

Visit the Secretary of State’s Voter Registration FAQ.

Contact Us

Elections Division


303-413-7728 (Fax)


Hours: 8 a.m. – 4:30 p.m. M-F


Boulder: 1750 33rd Street
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Longmont: 529 Coffman Street
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Lafayette: 1376 Miners Drive
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Mailing Address

1750 33rd Street, Suite 200
Boulder, CO 80301