Sully County, located in central South Dakota, is a historic county named after General Alfred Sully, known for building Fort Sully near the Missouri River. With a population of 1,446, the county encompasses an area of 1,070 square miles and is home to two communities, Agar and Onida, where the County Seat and courthouse are situated.
Established in 1883, Sully County offers a glimpse into South Dakota's rich history and natural beauty, attracting visitors with its scenic landscapes and proximity to the state capital, Pierre, located just thirty miles to the south.
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