Blue Earth County, Minnesota
| Blue Earth County | |
|---|---|
| Location within the U.S. state of Minnesota | |
| Minnesota's location within the U.S. | |
| Coordinates: 44°02′N 94°04′W / 44.03°N 94.06°W | |
| Country | United States | 
| State | Minnesota | 
| Founded | March 5, 1853 | 
| Named after | Blue Earth River | 
| Seat | Mankato | 
| Largest city | Mankato | 
| Area | |
|  • Total | 766 sq mi (1,980 km2) | 
| • Land | 748 sq mi (1,940 km2) | 
| • Water | 18 sq mi (50 km2) 2.3% | 
| Population  (2020) | |
|  • Total | 69,112 | 
|  • Estimate  (2024) | 70,700 | 
| • Density | 90/sq mi (35/km2) | 
| Time zone | UTC−6 (Central) | 
| • Summer (DST) | UTC−5 (CDT) | 
| Congressional district | 1st | 
| Website | www | 
Blue Earth County is a county in the state of Minnesota. As of the 2020 census, the population was 69,112. Its county seat is Mankato. The county is named for the Blue Earth River and for the deposits of blue-green clay once evident along the banks of the Blue Earth River. Blue Earth County is part of the Mankato-North Mankato metropolitan area.