21 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Le Sueur | 1 | 4,237 | 4,201 | 0.17% | 815 | 5 | City |
| Montgomery | 2 | 3,605 | 3,263 | 1.92% | 1,434 | 3 | City |
| Le Center | 3 | 2,533 | 2,507 | 0.2% | 1,511 | 2 | City |
| Lanesburgh | 4 | 2,061 | 1,994 | 0.63% | 64 | 32 | Township |
| Waterville | 5 | 1,767 | 1,744 | 0.23% | 1,048 | 2 | City |
| Kasota | 6 | 1,621 | 1,571 | 0.5% | 43 | 37 | Township |
| Elysian | 7 | 1,043 | 1,010 | 0.58% | 35 | 30 | Township |
| Washington | 8 | 805 | 780 | 0.5% | 66 | 12 | Township |
| Lexington | 9 | 779 | 755 | 0.65% | 23 | 34 | Township |
| Cleveland | 10 | 775 | 742 | 0.78% | 1,417 | 1 | City |
| Elysian | 11 | 772 | 707 | 1.71% | 655 | 1 | City |
| Cleveland | 12 | 736 | 714 | 0.41% | 22 | 34 | Township |
| Montgomery | 13 | 725 | 706 | 0.28% | 22 | 33 | Township |
| Kasota | 14 | 719 | 714 | 0.14% | 579 | 1 | City |
| Waterville | 15 | 693 | 674 | 0.43% | 23 | 31 | Township |
| Sharon | 16 | 659 | 637 | 0.76% | 19 | 35 | Township |
| Derrynane | 17 | 550 | 534 | 0.36% | 15 | 36 | Township |
| Tyrone | 18 | 531 | 514 | 0.76% | 15 | 35 | Township |
| Cordova | 19 | 513 | 497 | 0.39% | 15 | 35 | Township |
| Ottawa | 20 | 293 | 286 | 0% | 20 | 15 | Township |
| Heidelberg | 21 | 135 | 135 | 0% | 258 | 1 | City |
Le Sueur is the largest city in Le Sueur County, with a population of 4,237.
Heidelberg is the smallest city in Le Sueur County, with a population of 135.
There are 21 cities in Le Sueur County, Minnesota.