Sully County, County in central South Dakota, United States.
Sully County is a county in central South Dakota featuring rolling terrain and prairie landscape. The Missouri River marks its western edge and shapes the geography of the area.
The county was established in 1873 and organized in 1883. It was named after General Alfred Sully, who built Fort Sully near the Missouri River.
Agricultural traditions shape how people interact with the land and structure their lives across the region. The work of farming remains visible in the daily rhythm and landscape patterns.
The county seat of Onida is where you will find administrative services and the courthouse. The area is sparsely populated, so distances between towns can be considerable.
With sparse population density of roughly one person per square mile, this county ranks among the least populated areas in South Dakota. This remoteness defines much of the area's character.
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