From California Secretary of State Shirley Weber; I'm unhoused can I vote? All eligible voters have the right to vote including a person experiencing homelessness. Please note that you cannot use it p.o. box or business address to register to vote, but you can use a p.o. box or business address to receive mail. If you are unable to use an address when you register to vote, you must describe the location where you live so it is clear enough for your county election officials to find your voting precinct.