Uspo - Castle Rock

Post office

126 Cowlitz St. W, Castle Rock, WA 98611

Appointments Only.

Appointment required

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

Book at USPS Directions Facilities in Castle Rock Facilities in Washington

Uspo - Castle Rock accepts new U.S. passport applications in person in Castle Rock, WA. First-time and child visits are booked on the USPS scheduler. Search ZIP 98611. How to apply · How to renew