Sag Harbor Post Office

Post office

21 Long Island Avenue, Sag Harbor, NY 11963

(631) 725-8968

Appointments are requirred. Call 631-725-8968 to schedule Mon-Fri 10A-3P.

Appointment required

Hours and addresses come from the State Department listing, updated November 2, 2026.

Book at USPS Directions Facilities in Sag Harbor Facilities in New York

Sag Harbor Post Office accepts new U.S. passport applications in person in Sag Harbor, NY. First-time and child visits are booked on the USPS scheduler. Search ZIP 11963. How to apply · How to renew