Where to Register to vote
County Clerk and Recorder's office A voter registration form may be obtained on the Secretary of State's web site that you may mail to your County Clerk and Recorders office. You may also register to vote at a Colorado Department of Motor Vehicle office when you apply for a driver's license, or update your driver's license information. Additionally, you may register to vote at all offices that provide public assistance; provide state funded programs primarily engaged in providing services to persons with disabilities; recruitment offices of the armed forces of the United States; and any federal, state local government, or nongovernment office that chooses to provide voter registration service or applications. Offices of the county clerk and recorder and federal post office may provide mail-in voter registration applications.

Identification needed when registering by mail
If you register to vote by mail, you must include one of the following on your application:

• A valid Colorado driver's license number
• A valid identification number issued by the Department of Revenue
• Social Security number or at least the last four digits of your Social Security number
• If you do not have a Colorado driver's license number, a valid identification number issued by the Department of Revenue or Social Security number, you must indicate this on the application, and you will be issued a unique identifying number and be registered to vote.

You may be required to include a copy of one of the following documents when registering by mail, please contact your county clerk and recorder for more information:

• A current and valid Colorado driver’s license;
• A valid identification card issued by the Department of Revenue in accordance with the requirements of Part 3 of Article 2 of Title 42, C.R.S.;
• A valid U.S. passport;
• A valid employee identification card with a photograph of the eligible elector issued by any branch, department, agency, or entity of the United States government or of this state, or by any county, municipality, board, authority, or other political subdivision of this state;
• A valid pilot’s license issued by the federal aviation administration or other authorized agency of the United States;
• A valid U.S. military identification card with a photograph of the eligible elector;
• A copy of a current utility bill, bank statement, government check, paycheck, or other government document that shows the name and address of the elector. (A cable bill, a telephone bill, documentation from a public institution of higher education in Colorado containing at least the name, date of birth, and legal residence address of the student elector, a paycheck from a government institution, or a Certificate of Degree of Indian or Alaskan Native Blood are sufficient forms of identification);
• A valid Medicare or Medicaid card issued by the United States Health Care Financing Administration;
• A certified copy of a U.S. birth certificate for the elector issued in the United States; or
• Certified documentation of naturalization
• A valid student identification card with a photograph of the eligible elector issued by an institute of higher education in Colorado, as defined in section 23-3.1-102(5), C.R.S.

Any form of identification that contains an address must have a Colorado address to be valid.

Identification needed when registering in person
To register in person you will need one of the following:

• A valid Colorado driver’s license number
• Valid Colorado Department of Revenue Identification number
• At least the last four digits of your Social Security number.

Identification if I vote in person
When voting in person, you will need one of the following types of identification:

• A current and valid Colorado driver’s license;
• A valid identification card issued by the Department of Revenue in accordance with the requirements of Part 3 of Article 2 of Title 42, C.R.S.;
• A valid U.S. passport;
• A valid employee identification card with a photograph of the eligible elector issued by any branch, department, agency, or entity of the United States government or of this state, or by any county, municipality, board, authority, or other political subdivision of this state;
• A valid pilot’s license issued by the federal aviation administration or other authorized agency of the United States;
• A valid U.S. military identification card with a photograph of the eligible elector;
• A copy of a current utility bill, bank statement, government check, paycheck, or other government document that shows the name and address of the elector. (A cable bill, a telephone bill, documentation from a public institution of higher education in Colorado containing at least the name, date of birth, and legal residence address of the student elector, a paycheck from a government institution, or a Certificate of Degree of Indian or Alaskan Native Blood are sufficient forms of identification);
• A valid Medicare or Medicaid card issued by the United States Health Care Financing Administration;
• A certified copy of a U.S. birth certificate for the elector issued in the United States; or
• Certified documentation of naturalization
• A valid student identification card with a photograph of the eligible elector issued by an institute of higher education in Colorado, as defined in section 23-3.1-102(5), C.R.S.

A Social Security number (or last four digits) is NOT a legal form of identification for voting in person.

When is the last day to register to vote before an election