St Charles Main Post Office

Post office

112 S 5th St, St Charles, MO 63301

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 St Charles Facilities in Missouri

St Charles Main Post Office accepts new U.S. passport applications in person in St Charles, MO. First-time and child visits are booked on the USPS scheduler. Search ZIP 63301. How to apply · How to renew