Residents in Colorado can register to vote or update their voter registration online, in-person, or by mail.
Make sure to review the Registration Requirements & Information 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 Voter Service Center in order to vote.
Voter Registration Options
Online Voter Registration
Requires Colorado Driver’s License or Colorado State ID.
In-person Voter Registration
Register or update your voter registration in-person year-round at any of our three Boulder County Clerk & Recorder offices, open 8 a.m. – 4:30 p.m.
- Boulder: 1750 33rd Street
- Longmont: 529 Coffman Street
- Lafayette: 1376 Miners Drive
During election periods, qualified residents may also register to vote at any Voter Service Center.
Voter Registration by Mail, Email, or Fax
Register or update your voter registration by mail by completing the voter registration form and returning to our office by mail, email, or fax.
By Mail: Elections Division, 1750 33rd St., Suite 200, Boulder, CO 80301
By Email: Email a signed PDF to: Vote@BoulderCountyVotes.org
By Fax: 303-413-7728
If registering by mail, the voter registration takes effect as of the postmark date on the form. If the postmark is not legible, the effective date is the date received by the office.