Post Offices in & near Sinai, South Dakota. Operating hours, locations, phone/fax number, services information.
Post Office in Sinai, South Dakota on Main Ave. Operating hours, phone number, services information, and other locations.
Address: 301 Main Ave, Sinai, SD 57061
Phone: 605-826-4306
Fax: 605-357-4906
Toll-Free: 1-800-Ask-USPS® (275-8777)
TTY: 877-889-2457
