Walworth County, South Dakota
Walworth County | |
|---|---|
Location within the U.S. state of South Dakota | |
South Dakota's location within the U.S. | |
| Coordinates: 45°26′N 100°02′W / 45.43°N 100.03°W | |
| Country | United States |
| State | South Dakota |
| Founded | 1873 (created) 1883 (organized) |
| Named after | Walworth County, Wisconsin |
| Seat | Selby |
| Largest city | Mobridge |
| Area | |
• Total | 745 sq mi (1,930 km2) |
| • Land | 709 sq mi (1,840 km2) |
| • Water | 36 sq mi (90 km2) 4.8% |
| Population (2020) | |
• Total | 5,315 |
• Estimate (2024) | 5,270 |
| • Density | 7.1/sq mi (2.8/km2) |
| Time zone | UTC−6 (Central) |
| • Summer (DST) | UTC−5 (CDT) |
| Congressional district | At-large |
| Website | walworthco |
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Walworth County is a county in the U.S. state of South Dakota. As of the 2020 census, the population was 5,315. Its county seat is Selby. The county was created in 1873 and organized in 1883. It is named for Walworth County, Wisconsin.
The Missouri River flows southward along the county's west boundary line. Swan Creek flows west-northwest through the county's SW corner, discharging into the Missouri. The county's terrain consists of semi-arid rolling hills, carved by drainages and gullies. Most of the area is devoted to agriculture. The terrain slopes to the south and east, although the western portion of the county drops westward into the Missouri River valley. The county's highest point is on the eastern portion of its north boundary line, at 1,982 ft (604 m) ASL. The county has a total area of 745 square miles (1,930 km2), of which 709 square miles (1,840 km2) is land and 36 square miles (93 km2) (4.8%) is water.
The eastern portion of South Dakota's counties (48 of 66) observe Central Time; the western counties (18 of 66) observe Mountain Time. Walworth County is the westernmost of the SD counties to observe Central Time.