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


Disclaimer: This website is not regularly updated or maintained and has not been adopted as the official website for Sully County, South Dakota. For information regarding upcoming meetings, please contact the Sully County Auditor's Office.

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