South Dakota Counties Directory & Interactive Map
Complete official guide to all 66 counties in South Dakota (SD). Explore 2024 US Census population estimates, county seats, FIPS codes, land areas, and interactive mapping tools powered by GeoMap Suite.
South Dakota County Breakdown
Showing 6 of 6 documented counties and seats.
County Name | FIPS | County Seat | Population (Census) | Land Area | Quick Tool |
|---|---|---|---|---|---|
| Minnehaha County (Sioux Falls) | 46099 | Sioux Falls | 197,214 | 809 sq mi | Lookup |
| Pennington County (Rapid City) | 46103 | Rapid City | 109,222 | 2,777 sq mi | Lookup |
| Lincoln County | 46083 | Canton | 65,161 | 578 sq mi | Lookup |
| Brown County (Aberdeen) | 46013 | Aberdeen | 38,301 | 1,713 sq mi | Lookup |
| Brookings County | 46011 | Brookings | 34,375 | 794 sq mi | Lookup |
| Hughes County (Pierre) | 46065 | Pierre | 17,765 | 742 sq mi | Lookup |
Geographic Structure of South Dakota Counties
County Administration & Governance
In South Dakota, county governments manage vital public infrastructure, tax assessments, law enforcement, judicial courts, election administration, and public records. The county seat (Sioux Falls and other municipal headquarters) houses the primary courthouse, commissioners, and sheriff’s department.
All South Dakota counties carry a unique 5-digit Federal Information Processing Standard (FIPS) code, where the first two digits (46) designate the state and the remaining three digits identify each specific jurisdiction.
Geographic & Demographic Highlights
- Most Populous County:Minnehaha County (Sioux Falls) (197,214 residents)
- Largest by Land Area:Pennington County (Rapid City) (2,777 sq mi)
- State Capital:Pierre
- Census Bureau Region:Midwest United States
Demographic calculations derive from the United States Census Bureau 2024 Population Estimates Program (PEP) and TIGER/Line geographic boundary files.