13 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Mankato | 1 | 46,518 | 44,577 | 0.84% | 2,339 | 19.89 | City |
| North Mankato | 2 | 13,950 | 14,302 | -0.5% | 2,167 | 6.44 | City |
| Eagle Lake | 3 | 3,226 | 3,288 | -0.37% | 1,676 | 1.93 | City |
| Lake Crystal | 4 | 2,472 | 2,547 | -0.6% | 1,449 | 1.71 | City |
| Mapleton | 5 | 1,613 | 1,703 | -1.1% | 1,180 | 1.37 | City |
| Madison Lake | 6 | 1,333 | 1,252 | 1.21% | 985 | 1.35 | City |
| St. Clair | 7 | 717 | 752 | -0.97% | 1,105 | 0.65 | City |
| Good Thunder | 8 | 538 | 560 | -0.74% | 858 | 0.63 | City |
| Amboy | 9 | 506 | 538 | -1.17% | 1,622 | 0.31 | City |
| Vernon Center | 10 | 309 | 328 | -1.28% | 632 | 0.49 | City |
| Skyline | 11 | 280 | 289 | -0.71% | 1,429 | 0.20 | City |
| Pemberton | 12 | 220 | 230 | -0.9% | 1,170 | 0.19 | City |
| Garden City | 13 | 212 | 233 | -1.4% | 118 | 1.79 | CDP |
Mankato is the largest city in Blue Earth County, with a population of 46,518.
Garden City is the smallest city in Blue Earth County.
There are 13 cities in Blue Earth County, Minnesota.