16 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| St. Peter | 1 | 12,431 | 12,081 | 0.57% | 2,049 | 6.07 | City |
| Nicollet | 2 | 1,091 | 1,143 | -0.91% | 1,203 | 0.91 | City |
| Courtland | 3 | 712 | 734 | -0.56% | 273 | 2.61 | City |
| Lafayette township | 4 | 654 | 700 | -1.65% | 13 | 50.24 | Township |
| Lake Prairie township | 5 | 587 | 628 | -1.68% | 11 | 54.72 | Township |
| Oshawa township | 6 | 561 | 593 | -1.41% | 19 | 28.82 | Township |
| Courtland township | 7 | 538 | 575 | -1.65% | 15 | 36.74 | Township |
| Lafayette | 8 | 452 | 489 | -1.53% | 359 | 1.26 | City |
| Nicollet township | 9 | 451 | 479 | -1.53% | 14 | 32.83 | Township |
| West Newton township | 10 | 389 | 422 | -2.26% | 10 | 37.71 | Township |
| Traverse township | 11 | 281 | 303 | -2.09% | 12 | 22.58 | Township |
| New Sweden township | 12 | 266 | 285 | -1.85% | 7 | 35.76 | Township |
| Bernadotte township | 13 | 242 | 260 | -2.02% | 7 | 35.91 | Township |
| Granby township | 14 | 201 | 218 | -2.43% | 8 | 26.27 | Township |
| Brighton township | 15 | 120 | 129 | -1.64% | 7 | 17.52 | Township |
| Ridgely township | 16 | 99 | 107 | -1.98% | 5 | 18.59 | Township |
St. Peter is the largest city in Nicollet County, with a population of 12,431.
Ridgely township is the smallest city in Nicollet County.
There are 16 cities in Nicollet County, Minnesota.