| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Le Sueur | 1 | 4,217 | 4,199 | 0.17% | 811 | 5 | City |
| Montgomery | 2 | 3,607 | 3,262 | 1.92% | 1,435 | 3 | City |
| Le Center | 3 | 2,529 | 2,506 | 0.2% | 1,509 | 2 | City |
| Waterville | 4 | 1,761 | 1,744 | 0.23% | 1,044 | 2 | City |
| Cleveland | 5 | 778 | 747 | 0.78% | 1,422 | 1 | City |
| Elysian | 6 | 778 | 707 | 1.7% | 660 | 1 | City |
| Kasota | 7 | 729 | 712 | 0.14% | 587 | 1 | City |
| Heidelberg | 8 | 133 | 135 | -0.75% | 254 | 1 | City |
Le Sueur is the largest city in Le Sueur County, with a population of 4,217.
Heidelberg is the smallest city in Le Sueur County, with a population of 133.
There are 8 cities in Le Sueur County, Minnesota.