Sully County | |
|---|---|
 Sully Courthouse (2013) | |
 Location within the U.S. state of South Dakota | |
 South Dakota's location within the U.S. | |
| Coordinates: 44°43′N 100°08′W / 44.71°N 100.13°W | |
| Country |  United States |
| State |  South Dakota |
| Founded | 1873 (created) 1883 (organized) |
| Named for | Alfred Sully |
| Seat | Onida |
| Largest city | Onida |
| Area | |
| • Total | 1,070 sq mi (2,800 km2) |
| • Land | 1,007 sq mi (2,610 km2) |
| • Water | 63 sq mi (160 km2) 5.9% |
| Population (2020) | |
| • Total | 1,446 |
| • Estimate (2023) | 1,494  |
| • Density | 1.4/sq mi (0.52/km2) |
| Time zone | UTC−6 (Central) |
| • Summer (DST) | UTC−5 (CDT) |
| Congressional district | At-large |
| Website | www |
Sully County is a county in the U.S. state of South Dakota. As of the 2020 census, the population was 1,446,[1] making it the fifth-least populous county in South Dakota. Its county seat is Onida.[2] The county was created in 1873 and organized in 1883.[3] It is named after General Alfred Sully, who built Fort Sully.[4]
Sully County is included in the Micropolitan Statistical Area of Pierre.
- ^ "State & County QuickFacts". United States Census Bureau. Retrieved March 20, 2024.
- ^ "Find a County". National Association of Counties. Retrieved June 7, 2011.
- ^ "Dakota Territory, South Dakota, and North Dakota: Individual County Chronologies". Dakota Territory Atlas of Historical County Boundaries. The Newberry Library. 2006. Archived from the original on April 2, 2018. Retrieved March 31, 2015.
- ^ Legislative Manual, South Dakota, 2005, p. 597.