To be eligible to vote you must be:

• At least 18 years old
• A U.S. citizen
• A resident of Oklahoma
• Not convicted of a felony, or if you have been convicted, a period of time equal to the original judgment and sentence has expired*
• Not adjudged to be an incapacitated person prohibited from voting

You pay preregister to vote if you are at least 17 and a half years old, however, you cannot vote in an election until after your 18th birthday.

Incarcerated Voters & Returning Citizens: 

In Oklahoma, you lose the right to vote when you are convicted of a felony. You can't vote while incarcerated, on probation, or on parole. Your right to vote is automatically restored once you complete your full sentence. Pretrial detention and misdemeanors do not restrict your voting rights. 

Voters without traditional residence: 

If you do not have a street address or 911 address, you may write directions to your place of residence or provide the legal description (section, township, range) of the location of your home. You must provide a mailing address if you do not receive mail at your residential address. The mailing address on their registration form can be a P.O. box, local shelter, advocacy organization, outreach center, or the home of someone who will accept mail for you. 

For more information, please visit your state's resource.