12 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Mankato | 1 | 47,370 | 44,637 | 0.97% | 2,350 | 20 | City |
| North Mankato | 2 | 14,063 | 14,300 | -0.28% | 2,185 | 6 | City |
| Eagle Lake | 3 | 3,354 | 3,290 | 0.33% | 1,742 | 2 | City |
| Lake Crystal | 4 | 2,457 | 2,541 | -0.57% | 1,440 | 2 | City |
| Mapleton | 5 | 1,606 | 1,705 | -0.99% | 1,175 | 1 | City |
| Madison Lake | 6 | 1,345 | 1,252 | 1.2% | 994 | 1 | City |
| St. Clair | 7 | 705 | 740 | -0.84% | 1,086 | 1 | City |
| Good Thunder | 8 | 537 | 560 | -0.74% | 856 | 1 | City |
| Amboy | 9 | 504 | 536 | -0.98% | 1,615 | 0 | City |
| Vernon Center | 10 | 308 | 328 | -0.96% | 630 | 0 | City |
| Skyline | 11 | 280 | 286 | -0.36% | 1,429 | 0 | City |
| Pemberton | 12 | 217 | 232 | -0.91% | 1,154 | 0 | City |
Mankato is the largest city in Blue Earth County, with a population of 47,370.
Pemberton is the smallest city in Blue Earth County, with a population of 217.
There are 12 cities in Blue Earth County, Minnesota.