21 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Le Sueur | 1 | 4,231 | 4,205 | 0.12% | 814 | 5.20 | City |
| Montgomery | 2 | 3,673 | 3,260 | 2.31% | 1,461 | 2.51 | City |
| Le Center | 3 | 2,522 | 2,509 | 0.12% | 1,505 | 1.68 | City |
| Lanesburgh township | 4 | 2,052 | 1,988 | 0.64% | 64 | 32.14 | Township |
| Waterville | 5 | 1,756 | 1,746 | 0.11% | 1,042 | 1.69 | City |
| Kasota township | 6 | 1,618 | 1,570 | 0.56% | 43 | 37.39 | Township |
| Elysian township | 7 | 1,048 | 1,017 | 0.58% | 35 | 29.97 | Township |
| Washington township | 8 | 802 | 773 | 0.75% | 66 | 12.23 | Township |
| Cleveland | 9 | 780 | 742 | 1.04% | 1,426 | 0.55 | City |
| Lexington township | 10 | 776 | 753 | 0.65% | 23 | 33.95 | Township |
| Elysian | 11 | 769 | 706 | 1.72% | 653 | 1.18 | City |
| Cleveland township | 12 | 739 | 713 | 0.82% | 22 | 33.51 | Township |
| Montgomery township | 13 | 722 | 708 | 0.28% | 22 | 33 | Township |
| Kasota | 14 | 712 | 716 | -0.14% | 573 | 1.24 | City |
| Waterville township | 15 | 689 | 672 | 0.44% | 23 | 30.55 | Township |
| Sharon township | 16 | 657 | 634 | 0.77% | 19 | 35.38 | Township |
| Derrynane township | 17 | 549 | 531 | 0.73% | 15 | 35.72 | Township |
| Tyrone township | 18 | 521 | 507 | 0.39% | 15 | 35.39 | Township |
| Cordova township | 19 | 518 | 499 | 0.78% | 15 | 34.85 | Township |
| Ottawa township | 20 | 289 | 285 | 0% | 19 | 14.99 | Township |
| Heidelberg | 21 | 133 | 135 | 0% | 254 | 0.52 | City |
Le Sueur is the largest city in Le Sueur County, with a population of 4,231.
Heidelberg is the smallest city in Le Sueur County.
There are 21 cities in Le Sueur County, Minnesota.