Sully County | |
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![]() 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 | ![]() |
State | ![]() |
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 Pierre, SD Micropolitan Statistical Area.