Clayton Post Office

Post office

6150 Center Street, Clayton, CA 94517

Hours are not published. Call before you go.

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

Book at USPS Directions Facilities in Clayton Facilities in California

Clayton Post Office accepts new U.S. passport applications in person in Clayton, CA. First-time and child visits are booked on the USPS scheduler. Search ZIP 94517. How to apply · How to renew