38 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 |
| Mankato township | 5 | 1,759 | 1,811 | -0.85% | 72 | 24.33 | Township |
| Mapleton | 6 | 1,613 | 1,703 | -1.1% | 1,180 | 1.37 | City |
| South Bend township | 7 | 1,534 | 1,587 | -0.9% | 93 | 16.44 | Township |
| Madison Lake | 8 | 1,333 | 1,252 | 1.21% | 985 | 1.35 | City |
| Decoria township | 9 | 1,097 | 1,136 | -0.9% | 31 | 35.85 | Township |
| Rapidan township | 10 | 1,018 | 1,056 | -0.97% | 29 | 35.11 | Township |
| Lime township | 11 | 933 | 947 | -0.11% | 60 | 15.42 | Township |
| Garden City township | 12 | 816 | 844 | -0.97% | 25 | 32.60 | Township |
| Le Ray township | 13 | 738 | 760 | -0.81% | 23 | 31.86 | Township |
| St. Clair | 14 | 717 | 752 | -0.97% | 1,105 | 0.65 | City |
| Jamestown township | 15 | 659 | 677 | -0.75% | 46 | 14.26 | Township |
| Good Thunder | 16 | 538 | 560 | -0.74% | 858 | 0.63 | City |
| Judson township | 17 | 516 | 534 | -0.96% | 14 | 36.45 | Township |
| Amboy | 18 | 506 | 538 | -1.17% | 1,622 | 0.31 | City |
| McPherson township | 19 | 406 | 421 | -0.98% | 12 | 34.81 | Township |
| Eagle Lake township | 20 | 395 | 396 | 0% | 13 | 31.24 | Township |
| Beauford township | 21 | 365 | 377 | -0.82% | 10 | 35.61 | Township |
| Vernon Center | 22 | 309 | 328 | -1.28% | 632 | 0.49 | City |
| Medo township | 23 | 306 | 320 | -1.29% | 9 | 34.95 | Township |
| Lyra township | 24 | 282 | 296 | -1.4% | 8 | 35.07 | Township |
| Skyline | 25 | 280 | 289 | -0.71% | 1,429 | 0.20 | City |
| Butternut Valley township | 26 | 280 | 294 | -1.41% | 8 | 35.26 | Township |
| Mapleton township | 27 | 270 | 281 | -1.1% | 8 | 34.25 | Township |
| Cambria township | 28 | 246 | 253 | -0.81% | 13 | 19.25 | Township |
| Sterling township | 29 | 235 | 242 | -0.84% | 7 | 34.36 | Township |
| Shelby township | 30 | 233 | 246 | -1.69% | 7 | 35.16 | Township |
| Vernon Center township | 31 | 231 | 244 | -1.7% | 7 | 35.08 | Township |
| Pemberton | 32 | 220 | 230 | -0.9% | 1,170 | 0.19 | City |
| Danville township | 33 | 214 | 224 | -1.38% | 6 | 35.77 | Township |
| Garden City | 34 | 212 | 233 | -1.4% | 118 | 1.79 | CDP |
| Lincoln township | 35 | 194 | 204 | -1.52% | 5 | 35.89 | Township |
| Pleasant Mound township | 36 | 191 | 201 | -1.55% | 5 | 35.91 | Township |
| Ceresco township | 37 | 177 | 184 | -1.12% | 5 | 35.66 | Township |
| Amboy township | 38 | 130 | 138 | -1.52% | 4 | 35.61 | Township |
Mankato is the largest city in Blue Earth County, with a population of 46,518.
Amboy township is the smallest city in Blue Earth County.
There are 38 cities in Blue Earth County, Minnesota.