20 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Brookfield | 1 | 4,663 | 4,725 | -0.32% | 105 | 45 | Township |
| Brookfield | 2 | 4,053 | 4,100 | -0.22% | 932 | 4 | City |
| Marceline | 3 | 2,569 | 2,602 | -0.35% | 85 | 30 | Township |
| Marceline | 4 | 2,100 | 2,124 | -0.24% | 640 | 3 | City |
| Parson Creek | 5 | 770 | 773 | -0.13% | 14 | 56 | Township |
| Jefferson | 6 | 665 | 672 | -0.3% | 12 | 56 | Township |
| Bucklin | 7 | 630 | 635 | -0.16% | 14 | 44 | Township |
| Locust Creek | 8 | 522 | 530 | -0.38% | 11 | 49 | Township |
| Meadville | 9 | 414 | 416 | 0% | 767 | 1 | City |
| Bucklin | 10 | 406 | 410 | -0.25% | 343 | 1 | City |
| Yellow Creek | 11 | 352 | 352 | 0% | 10 | 37 | Township |
| Clay | 12 | 303 | 304 | 0% | 6 | 50 | Township |
| Laclede | 13 | 297 | 302 | -0.34% | 238 | 1 | City |
| Linneus | 14 | 273 | 278 | -0.36% | 256 | 1 | City |
| Grantsville | 15 | 258 | 259 | 0% | 6 | 46 | Township |
| Browning | 16 | 212 | 217 | -0.47% | 405 | 1 | City |
| Baker | 17 | 182 | 185 | -0.55% | 4 | 46 | Township |
| Purdin | 18 | 139 | 141 | 0% | 454 | 0 | City |
| North Salem | 19 | 111 | 111 | 0% | 3 | 44 | Township |
| Enterprise | 20 | 80 | 80 | 0% | 3 | 25 | Township |
Brookfield is the largest city in Linn County, with a population of 4,663.
Enterprise is the smallest city in Linn County, with a population of 80.
There are 20 cities in Linn County, Missouri.