21 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Le Sueur | 1 | 4,244 | 4,201 | 0.17% | 816 | 5 | City |
| Montgomery | 2 | 3,674 | 3,263 | 1.91% | 1,461 | 3 | City |
| Le Center | 3 | 2,538 | 2,507 | 0.2% | 1,514 | 2 | City |
| Lanesburgh | 4 | 2,074 | 1,994 | 0.63% | 65 | 32 | Township |
| Waterville | 5 | 1,772 | 1,744 | 0.28% | 1,051 | 2 | City |
| Kasota | 6 | 1,629 | 1,571 | 0.49% | 44 | 37 | Township |
| Elysian | 7 | 1,049 | 1,010 | 0.58% | 35 | 30 | Township |
| Washington | 8 | 809 | 780 | 0.5% | 66 | 12 | Township |
| Elysian | 9 | 785 | 707 | 1.68% | 666 | 1 | City |
| Lexington | 10 | 784 | 755 | 0.64% | 23 | 34 | Township |
| Cleveland | 11 | 782 | 742 | 0.9% | 1,430 | 1 | City |
| Cleveland | 12 | 739 | 714 | 0.41% | 22 | 34 | Township |
| Montgomery | 13 | 727 | 706 | 0.28% | 22 | 33 | Township |
| Kasota | 14 | 720 | 714 | 0.14% | 580 | 1 | City |
| Waterville | 15 | 696 | 674 | 0.43% | 23 | 31 | Township |
| Sharon | 16 | 664 | 637 | 0.76% | 19 | 35 | Township |
| Derrynane | 17 | 552 | 534 | 0.36% | 15 | 36 | Township |
| Tyrone | 18 | 535 | 514 | 0.75% | 15 | 35 | Township |
| Cordova | 19 | 515 | 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 4,244.
Heidelberg is the smallest city in Le Sueur County, with a population of 135.
There are 21 cities in Le Sueur County, Minnesota.