Grant County, South Dakota

Grant County
County Courthouse
Location within the U.S. state of South Dakota
South Dakota's location within the U.S.
Coordinates: 45°10′N 96°46′W / 45.17°N 96.77°W / 45.17; -96.77
Country United States
State South Dakota
Founded1873 (created)
January 8, 1878 (organized)
Named afterUlysses S. Grant
SeatMilbank
Largest cityMilbank
Area
  Total
688 sq mi (1,780 km2)
  Land681 sq mi (1,760 km2)
  Water6.1 sq mi (16 km2)  0.9%
Population
 (2020)
  Total
7,556
  Estimate 
(2024)
7,618
  Density11/sq mi (4.2/km2)
Time zoneUTC−6 (Central)
  Summer (DST)UTC−5 (CDT)
Congressional districtAt-large
Websitegrantcounty.sd.gov

Grant County is a county in the U.S. state of South Dakota. As of the 2020 census, the population was 7,556. The county seat is Milbank. The county was founded in 1873 and organized in 1878. It is named for Ulysses S. Grant, 18th President of the United States.