An American citizen can renew his passport at a Department of State passport agency or at a passport acceptance facility such as a post office, according to the U.S Department of State's Bureau of Consular Affairs. Certain persons are eligible to renew their passport through the mail.
An individual can renew a passport by mail if the passport meets a set of criteria, explains the U.S Department of State. The passport cannot have damage, and the person must submit it along with the renewal application. The passport cannot be more than 15 years old, and the person must have received the passport at age 16 or older. Additionally, the passport must be in the person's current name. If not, the person must legally document the name change with an original or certified copy of a marriage certificate or other government-issued document proving a legal name change occurred.