Sully, County

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700 Ash Ave
Onida, SD 57564

Sully County, South Dakota, established in 1883, is situated in the central part of the state, approximately thirty miles north of Pierre, the state capital. Named after General Alfred Sully, who constructed Fort Sully near the Missouri River, the county encompasses two communities, Agar and Onida, with Onida serving as the county seat.

The county covers a total area of 1,070 square miles and had a population of 1,446 according to the 2020 Census. Sully County's rich history and central location make it a notable region within South Dakota.

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