Voter Registration & Information

Voter Eligibility Requirements

In order to vote in Colorado, you must be:

A U.S. citizen

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 (NOTE: Those on probation or parole ARE ELIGIBLE to vote.)

Age Requirements:

16-year-olds and 17-year-olds can preregister to vote

18-year-olds can register and vote in any election.

3 Ways to Register to Vote or Update your Registration

Be sure to check the registration requirements on this page prior to registering. A registered voter in Colorado is considered a resident of Colorado for income tax and motor vehicle registration and operation.

Qualified residents 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’s office must receive your voter registration no later than 8 days before the election. If you register after this time, you must visit a Vote Center in order to vote.

Attention CU students living on campus – please see our College Students page for instructions about how to enter your address so your mail ballots can find you.

Register Online

Register to vote or update your registration using your Colorado driver’s license, Colorado State ID, or the last 4 digits of your Social Security number*. Voter website in Español.

*If you register as a new voter online with the last 4 digits of your SSN, you will be asked to complete additional steps to provide us with your signature.

3 images in a row, first of person typing, second of a mailbox, third of a fax machine

Email, Mail, or Fax

Register to vote or update your registration by filling out a paper form and returning it to our office via email, mail, or fax. View contact information to return your form. View instructions for completing the form.

Registration/updates will take effect as of the postmark date on the form. (If postmark is not legible, the effective date is the date received by the office.)

Register In-Person

During election periods, eligible residents may also register to vote at any Vote Center.

More Info

Registration Timeline

There is no deadline to register to vote in Colorado. However, in order to receive a mail ballot, your registration must be received at least 8 days before the election. If you miss this deadline, you can register and get a ballot on the same day at a Vote Center.

Traveling during an election

If you will be out-of-town during an election, you can have your ballot mailed to your temporary address by updating the mailing address in your voter registration. This must be done at least 8 days before the election. Don’t forget to update your address again once you return!

Contact Us

Elections Division

303-413-7740

303-413-7728 (Fax)

vote@bouldercounty.gov
Boulder County Elections website

7:30 a.m. to 5 p.m.
Monday-Thursday
Closed Fridays

Location

Boulder: 1750 33rd St. (main office)
Map and Directions Boulder Location

Longmont: 529 Coffman St.*
Map and Directions Longmont Location

Lafayette: 1755 S. Public Road*
Map and Directions Lafayette Location
* Longmont and Lafayette locations only offer paper voter registration forms

Mailing Address

1750 33rd St., Suite 200
Boulder, CO 80301

Boulder County Elections logo