Sully County, South Dakota, established in 1883, is a central South Dakota county located just thirty miles north of the state capital, Pierre. Named after General Alfred Sully, who constructed Fort Sully near the Missouri River, the county encompasses an area of 1,070 square miles and is home to two communities, Agar and Onida.
Onida, the county seat, houses the Sully County Courthouse and serves as the administrative hub for the region. With a population of 1,446 according to the 2020 Census, Sully County offers a tranquil and picturesque setting for residents and visitors alike.
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