The largest county in South Dakota

There are two right answers. By land area it is Meade County; by population it is Minnehaha County. Which one you want depends on what you meant by largest.

Largest by land area

Meade County

3,471 sq mi

4.6% of South Dakota's land

Largest by population

Minnehaha County

212,691 people

22.7% of South Dakota's population

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025. Retrieved 30 August 2026.

By land area

The ten largest counties of South Dakota by land area. Land area excludes inland and coastal water.
RankNameLand areaPopulation
1Meade County3,471 sq mi30,711
2Perkins County2,870 sq mi2,853
3Pennington County2,777 sq mi116,792
4Harding County2,672 sq mi1,331
5Corson County2,470 sq mi3,781
6Dewey County2,302 sq mi5,419
7Butte County2,250 sq mi10,856
8Oglala Lakota County2,094 sq mi13,338
9Ziebach County1,961 sq mi2,389
10Jackson County1,864 sq mi2,666

By population

The ten most populous counties of South Dakota, from the Census Bureau's Vintage 2025 estimates.
RankNamePopulationDensity
1Minnehaha County212,691264 per sq mi
2Pennington County116,79242.1 per sq mi
3Lincoln County77,145134 per sq mi
4Brookings County37,63547.5 per sq mi
5Brown County37,56121.9 per sq mi
6Meade County30,7118.9 per sq mi
7Codington County29,56243.0 per sq mi
8Lawrence County29,45936.8 per sq mi
9Yankton County23,63545.3 per sq mi
10Davison County20,06946.1 per sq mi

And the smallest

Smallest by land area

Clay County

412 sq mi

Least populous

Jones County

913 people

More on South Dakota

Rebuilt from source data 30 August 2026. How these figures are produced.