Passports as a Form of Identification.
Even if you are not planning to travel it isn’t a bad idea to have a valid U.S. Passport as a form of identification.
Passports are a valid form of identification for Proof of Citizenship. There are many reasons why you may need to prove your citizenship. If you are applying for US benefits, a job in the US, or college in the US, for example, you may need to prove your status. A certificate of naturalization or certificate of citizenship can prove your status. In virtually all situations, however, a US passport is enough to prove your status. You can use your passport to travel and to prove US citizenship, even when applying for government benefits, making it one of the more flexible forms of identification.