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 ASL. The county has a total area of , of which is land and (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.

Major highways

  • 20px U.S. Highway 12
  • 20px U.S. Highway 83
  • 20px South Dakota Highway 20
  • 20px South Dakota Highway 47
  • 23px South Dakota Highway 130
  • 23px South Dakota Highway 144
  • 23px South Dakota Highway 271
  • 23px South Dakota Highway 1804

Adjacent counties

  • Campbell County – north
  • McPherson County – northeast
  • Edmunds County – east
  • Potter County – south
  • Dewey County – southwest (observes Mountain Time)
  • Corson County – northwest (observes Mountain Time)

Protected areas

Source:

|align-fn=center

|footnote=U.S. Decennial Census<br>1790–1960 1900–1990<br>1990–2000 2010–2020

The racial makeup of the county was 77.9% White, 0.2% Black or African American, 15.2% American Indian and Alaska Native, 0.3% Asian, 0.4% from some other race, and 6.0% from two or more races. Hispanic or Latino residents of any race comprised 1.9% of the population.

There were 2,271 households in the county, of which 25.7% had children under the age of 18 living with them and 25.7% had a female householder with no spouse or partner present. About 33.5% of all households were made up of individuals and 17.6% had someone living alone who was 65 years of age or older.

<!-- PresRow should be -->

Education

School districts include:

  • Bowdle School District 22-1
  • Hoven School District 53-2
  • Mobridge-Pollock School District 62-6
  • Selby School District 62-5

See also

  • National Register of Historic Places listings in Walworth County, South Dakota

References