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County in South Dakota, United States

Codington County is a county in the U. S. state of South Dakota. As of the 2020 census, the population was 28,325, making it the 7th most populous county in South Dakota. Its county seat is Watertown. The county was created in 1877 and organized in 1878. It is named for Rev. George S. S. Codington, Dakota Territory legislator. Codington County comprises the Watertown, SD Micropolitan Statistical Area.

Codington County terrain consists of rolling hills dotted with lakes and ponds, especially in the southwest portion. The land is largely devoted to agriculture. The terrain is higher on the county's east and west sides, and generally slopes to the south. The county has a total area of 717 square miles (1,857 km2), of which 688 square miles (1,782 km2) is land and 29 square miles (75 km2) (4.0%) is water.

As of the 2010 census, there were 27,227 people, 11,432 households, and 7,216 families in the county. The population density was There were 12,397 housing units at an average density of The racial makeup of the county was 95.3% white, 2.0% American Indian, 0.4% Asian, 0.3% black or African American, 0.6% from other races, and 1.3% from two or more races. Those of Hispanic or Latino origin made up 1.6% of the population. In terms of ancestry, 54.3% were German, 22.6% were Norwegian, 9.6% were Irish, 6.7% were English, and 3.3% were American. Of the 11,432 households, 30.7% had children under the age of 18 living with them, 49.9% were married couples living together, 9.0% had a female householder with no husband present, 36.9% were non families, and 30.6% of all households were made up of individuals. The average household size was 2.35 and the average family size was 2.93. The median age was 37.7 years. The median income for a household in the county was $43,275 and the median income for a family was $60,202. Males had a median income of $39,076 versus $26,945 for females. The per capita income for the county was $24,781. About 8.9% of families and 12.7% of the population were below the poverty line, including 13.7% of those under age 18 and 16.8% of those age 65 or over.