If you are talking about a US passport and are close a Department of State Passport Agency, you can MAKE AN APPOINTMENT, then go in person. You will have to pay the expediated fee, have proof of international travel within 2 weeks but they can make you a passport same day. As long as you can get an appointment. Even if you can't you can go there and wait, its not written anywhere, but they may take you without an appointment.

See: https://travel.state.gov/content/pas...expedited.html