16 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Coeur | 1 | 57,955 | 54,954 | 1.05% | 3,596 | 16 | City |
| Post Falls | 2 | 47,424 | 39,304 | 3.55% | 2,557 | 19 | City |
| Hayden | 3 | 17,242 | 15,650 | 1.88% | 1,638 | 11 | City |
| Rathdrum | 4 | 13,459 | 9,291 | 6.6% | 1,935 | 7 | City |
| Spirit Lake | 5 | 2,494 | 2,346 | 1.18% | 1,015 | 2 | City |
| Dalton Gardens | 6 | 2,487 | 2,539 | -0.44% | 1,044 | 2 | City |
| Hauser | 7 | 926 | 764 | 3.58% | 764 | 1 | City |
| Athol | 8 | 745 | 709 | 0.95% | 656 | 1 | City |
| Hayden Lake | 9 | 676 | 656 | 0.6% | 1,106 | 1 | City |
| Rockford Bay | 10 | 337 | 355 | 3.37% | 89 | 4 | CDP |
| Worley | 11 | 249 | 254 | -0.4% | 1,284 | 0 | City |
| Harrison | 12 | 221 | 231 | -0.9% | 62 | 4 | City |
| Conkling Park | 13 | 163 | 128 | 7.24% | 156 | 1 | CDP |
| Fernan Lake Village | 14 | 158 | 166 | -1.25% | 2,079 | 0 | City |
| Huetter | 15 | 105 | 100 | 0.96% | 2,333 | 0 | City |
| State Line | 16 | 38 | 37 | 0% | 345 | 0 | City |
Coeur is the largest city in Kootenai County, with a population of 57,955.
State Line is the smallest city in Kootenai County, with a population of 38.
There are 16 cities in Kootenai County, Idaho.