| County: | Minnehaha County |
| State: | South Dakota |
| Founded Year: | 1862 (created) 1868 (organized) |
| Seat Wl: | Sioux Falls |
| Largest City: | Sioux Falls |
| Area Total Sq Mi: | 814 |
| Area Land Sq Mi: | 807 |
| Area Water Sq Mi: | 6.7 |
| Area Percentage: | 0.8 |
| Population As Of: | 2020 |
| Population Total: | 197214 |
| Pop Est As Of: | 2023 |
| Population Est: | 206930 |
| Population Density Sq Mi: | 239 |
| Time Zone: | Central |
| Web: | www.minnehahacounty.org |
| Named For: | "rapid water" |
| Ex Image: | Minnehaha County Courthouse 9.jpg |
| Ex Image Cap: | Minnehaha County Courthouse in Sioux Falls |
| District: | At-large |
Minnehaha County is a county on the eastern border of the state of South Dakota. As of the 2020 census, the population was 197,214,[1] making it the state's most populous county. It contains over 20% of the state's population. Its county seat is Sioux Falls,[2] South Dakota's most populous city. The county was created in 1862 and organized in 1868.[3] Its name was derived from the Sioux word Mnihaha, meaning "rapid water," or "waterfall" (often incorrectly translated as "laughing water").[4]
Minnehaha County is part of the Sioux Falls Metropolitan Statistical Area, the state's largest.
Minnehaha County lies on the east side of South Dakota. Its eastern boundary abuts Minnesota as well as the northern and western boundaries of Iowa. The Big Sioux River flows south-southeast through the east central part of the county. Its terrain consists of rolling hills, devoted to agriculture except around built-up areas, and dotted with lakes and ponds in its western portion.[5] Its terrain generally slopes southward, and the east and west edges slope to the river valley through the center of the county. Its highest point is in the northwest corner, at 1752feet ASL.[6]
Minnehaha County has an area of, of which is land and (0.8%) is water.[7]
As of the 2020 census, there were 197,214 people, 78,715 households, and 48,690 families residing in the county.[8] The population density was . There were 83,717 housing units.
As of the 2010 census, there were 169,468 people, 67,028 households, and 42,052 families in the county. The population density was . There were 71,557 housing units at an average density of . The racial makeup of the county was 88.1% white, 3.8% Black or African American, 2.5% American Indian, 1.5% Asian, 0.1% Pacific islander, 1.8% from other races, and 2.3% from two or more races. Those of Hispanic or Latino origin made up 4.1% of the population. In terms of ancestry, 43.8% were German, 17.7% were Norwegian, 11.6% were Irish, 6.8% were Dutch, 6.3% were English, and 3.2% were American.
Of the 67,028 households, 32.7% had children under the age of 18 living with them, 47.7% were married couples living together, 10.5% had a female householder with no husband present, 37.3% were non-families, and 29.3% of all households were made up of individuals. The average household size was 2.43 and the average family size was 3.03. The median age was 34.5 years.
The median income for a household in the county was $51,799 and the median income for a family was $64,645. Males had a median income of $40,187 versus $31,517 for females. The per capita income for the county was $26,392. About 6.9% of families and 9.7% of the population were below the poverty line, including 12.2% of those under age 18 and 7.6% of those age 65 or over.
Minnehaha is somewhat conservative for an urban county. Only four Democratic presidential candidates in five different elections have carried the county since 1940.
In the South Dakota Legislature, Sioux Falls falls into Districts 9-15, with each district electing two Representatives and one Senator. Only two out of seven districts (10th and 15th) are represented by Democrats.
School districts in the county include:[9]
Various rural schools operated in the county's history.[10]