Humboldt Post Office

Post office

601 Sumner Ave., Humboldt, IA 50548

(515) 332-3506

By appointment. Please call(515)332-3506.

Appointment required

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

Book at USPS Directions Facilities in Humboldt Facilities in Iowa

Humboldt Post Office accepts new U.S. passport applications in person in Humboldt, IA. First-time and child visits are booked on the USPS scheduler. Search ZIP 50548. How to apply · How to renew