Voters must include their current residence on their voter registration application. Residence is considered to be the place where you sleep, so if you sleep in a shelter, at a friend's residence, or under a bridge, this is your residence. If your residence is a place where the post office will not deliver mail to you, then you should include your mailing address on the registration form, if you have one.

If you pre-register and do not have a mailing address, then your record will be flagged as "challenged" and you will have to answer some questions before being allowed to vote. You will be challenged because the county would not have been able to verify your address prior to the election. The election judge will ask you about where you live and you will have to swear that you are eligible to vote before you will be given a ballot.

Homeless individuals who have not pre-registered to vote often have difficulty providing proper proof of residence, as is required to complete Election Day registration. As such, the law makes special accommodations for those who are staying at homeless shelters. In this case, employees of the shelter are allowed to "vouch" for the homeless individual, meaning that the employee signs a sworn statement that they personally know that the homeless individual resides at the shelter.