Post Offices in & near Onaka, South Dakota. Operating hours, locations, phone/fax number, services information.
Post Office in Onaka, South Dakota on Main St. Operating hours, phone number, services information, and other locations.
Address: 123 Main St, Onaka, SD 57466
Phone: 605-447-5885
Fax: 605-357-4906
Toll-Free: 1-800-Ask-USPS® (275-8777)
TTY: 877-889-2457
