Post Offices

Post Offices in & near Sinai, South Dakota. Operating hours, locations, phone/fax number, services information.

Sina Post Office

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

Retail Hours

Monday 10:00am - 12:00pm
Tuesday 10:00am - 12:00pm
Wednesday 10:00am - 12:00pm
Thursday 10:00am - 12:00pm
Friday 10:00am - 12:00pm
Saturday 10:00am - 12:00pm
Sunday Closed

Lobby Hours

Monday 24 hours
Tuesday 24 hours
Wednesday 24 hours
Thursday 24 hours
Friday 24 hours
Saturday 24 hours
Sunday Closed

Last Collection Times

Monday 12:00pm
Tuesday 12:00pm
Wednesday 12:00pm
Thursday 12:00pm
Friday 12:00pm
Saturday 12:00pm
Sunday Closed