20 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Polson | 1 | 5,748 | 5,160 | 2.08% | 1,280 | 4 | City |
| Ronan | 2 | 2,234 | 1,972 | 2.38% | 1,818 | 1 | City |
| Pablo | 3 | 1,685 | 2,032 | -2.21% | 348 | 5 | CDP |
| St. Ignatius | 4 | 841 | 786 | 1.33% | 1,578 | 1 | Town |
| Arlee | 5 | 707 | 592 | 0.71% | 109 | 6 | CDP |
| Lindisfarne | 6 | 548 | 465 | 3.4% | 213 | 3 | CDP |
| Finley Point | 7 | 455 | 486 | -0.44% | 107 | 4 | CDP |
| Charlo | 8 | 350 | 261 | -0.57% | 176 | 2 | CDP |
| Kings Point | 9 | 338 | 206 | 3.68% | 250 | 1 | CDP |
| Kerr | 10 | 227 | 159 | -0.87% | 249 | 1 | CDP |
| Ravalli | 11 | 216 | 220 | 6.93% | 82 | 3 | CDP |
| Rocky Point | 12 | 195 | 126 | 7.14% | 321 | 1 | CDP |
| Jette | 13 | 177 | 161 | -2.75% | 286 | 1 | CDP |
| Big Arm | 14 | 166 | 89 | 0% | 31 | 5 | CDP |
| Elmo | 15 | 163 | 252 | -0.61% | 514 | 0 | CDP |
| Dayton | 16 | 142 | 111 | 6.77% | 259 | 1 | CDP |
| Turtle Lake | 17 | 114 | 124 | -5% | 191 | 1 | CDP |
| Rollins | 18 | 105 | 156 | -6.25% | 37 | 3 | CDP |
| Lake Mary Ronan | 19 | 72 | 45 | 5.88% | 69 | 1 | CDP |
| Kicking Horse | 20 | 61 | 109 | -19.74% | 25 | 2 | CDP |
Polson is the largest city in Lake County, with a population of 5,748.
Kicking Horse is the smallest city in Lake County, with a population of 61.
There are 20 cities in Lake County, Montana.