Sully County, South Dakota, organized in 1883, is located in central South Dakota, thirty miles north from South Dakota's State Capital, Pierre. The county is named after General Alfred Sully, who built Fort Sully near the Missouri River.  Sully County has two communities, Agar and Onida. Onida is the County Seat and this is where the courthouse is located.

Population (2010 Census): 1,373
Total Area: 1,070 Square Miles

Sully County Tire Cleanup
All county residents, excluding businesses, can take advantage of the free waste tire cleanup program being offered from May 1st through June 28th. We will be accepting tires only, rims must be removed for acceptance. The drop off location will be at the County Shop, 812 Cherry Ave. The shop is open Monday through Thursday from 7:00 to 5:30. Please stop by the office before unloading. For more information please call 258-2235 or 222-2623.

Latest Blog Posts: Courtroom Notice (2/27/2018)

Effective May 14th

Sully County Courthouse hours will be:

Monday through Friday

7:30 am to 11:30 am

12:30 pm to 4:30 pm

Closed for lunch 11:30 am to 12:30 pm


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