8 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Princeton | 1 | 5,488 | 5,011 | 1.48% | 1,113 | 5 | City |
| Milaca | 2 | 3,085 | 3,010 | 0.42% | 905 | 3 | City |
| Onamia | 3 | 856 | 778 | 1.54% | 872 | 1 | City |
| Isle | 4 | 837 | 806 | 0.6% | 309 | 3 | City |
| Foreston | 5 | 590 | 557 | 1.03% | 412 | 1 | City |
| Wahkon | 6 | 255 | 236 | 1.19% | 267 | 1 | City |
| Pease | 7 | 245 | 238 | 0.41% | 464 | 1 | City |
| Bock | 8 | 81 | 78 | 1.25% | 485 | 0 | City |
Princeton is the largest city in Mille Lacs County, with a population of 5,488.
Bock is the smallest city in Mille Lacs County, with a population of 81.
There are 8 cities in Mille Lacs County, Minnesota.