Uspo - Mercer Island

Post office

3040 78th Ave Se, Mercer Island, WA 98040

By Appointment Only: (206) 232-8834

Appointment required

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

Book at USPS Directions Facilities in Mercer Island Facilities in Washington

Uspo - Mercer Island accepts new U.S. passport applications in person in Mercer Island, WA. First-time and child visits are booked on the USPS scheduler. Search ZIP 98040. How to apply · How to renew