Complete the passport application (found on the USPS website) ahead of time. You can print a blank form and fill it in by hand or you can complete it online at the Department of State website and then print it out. Do not sign the application until you are directed to do so by the USPS agent.
Compile all required identification and bring it with you. You will need proof of citizenship, which can be in the form of a U.S. passport, a certified copy of your birth certificate, a consular report for those citizens born abroad, or a certificate of naturalization or citizenship. You will also need secondary identification, such as your current driver's license or military or government identification card. You must also bring a photocopy of the identification you are presenting.
You may have your photograph taken at post offices that offer the service for an additional fee, which is $15 as of July 2010. You may also bring your photographs. You must supply two identical color photographs, each 2 inches by 2 inches. They must be frontal, full-face views against a white or off-white backdrop, and must have been taken no more than six months earlier. The photographs should represent your normal appearance, which includes glasses or other items you normally wear. Sunglasses and hats should not be worn.
Fees for passports are paid to two different suppliers. The acceptance fee, which is $25 as of July 2010, is paid to the post office. The application fee is based on whether the applicant is younger or older than 16 and whether the applicant desires a passport book, card or both. This fee is paid at the post office but goes to the Department of State.
The post office accepts all forms of payment except a postal payment card for acceptance fees. The State Department, however, will not accept debit cards, foreign money orders, credit cards or postal payment cards. Cash payments must be converted to a money order, which can be purchased from the post office.