Sioux City Post Office

Post office

214 Jackson Street, Sioux City, IA 51101

(712) 277-6402

By appointment. Please call (712)277-6401.

Appointment required

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

Book at USPS Directions Facilities in Sioux City Facilities in Iowa

Sioux City Post Office accepts new U.S. passport applications in person in Sioux City, IA. First-time and child visits are booked on the USPS scheduler. Search ZIP 51101. How to apply · How to renew