Mason City Post Office

Post office

211 N. Delaware Ave., Mason City, IA 50401

(641) 423-5231

By appointment Monday thru Saturday. Please call (641)423-5231.

Appointment required

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

Book at USPS Directions Facilities in Mason City Facilities in Iowa

Mason City Post Office accepts new U.S. passport applications in person in Mason City, IA. First-time and child visits are booked on the USPS scheduler. Search ZIP 50401. How to apply · How to renew

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