20 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Brookfield township | 1 | 4,663 | 4,725 | -0.32% | 105 | 44.57 | Township |
| Brookfield | 2 | 4,053 | 4,100 | -0.22% | 932 | 4.35 | City |
| Marceline township | 3 | 2,569 | 2,602 | -0.35% | 85 | 30.14 | Township |
| Marceline | 4 | 2,100 | 2,124 | -0.24% | 640 | 3.28 | City |
| Parson Creek township | 5 | 770 | 773 | -0.13% | 14 | 55.61 | Township |
| Jefferson township | 6 | 665 | 672 | -0.3% | 12 | 55.77 | Township |
| Bucklin township | 7 | 630 | 635 | -0.16% | 14 | 44.39 | Township |
| Locust Creek township | 8 | 522 | 530 | -0.38% | 11 | 49.41 | Township |
| Meadville | 9 | 414 | 416 | 0% | 767 | 0.54 | City |
| Bucklin | 10 | 406 | 410 | -0.25% | 343 | 1.18 | City |
| Yellow Creek township | 11 | 352 | 352 | 0% | 10 | 36.80 | Township |
| Clay township | 12 | 303 | 304 | 0% | 6 | 49.86 | Township |
| Laclede | 13 | 297 | 302 | -0.34% | 238 | 1.25 | City |
| Linneus | 14 | 273 | 278 | -0.36% | 256 | 1.07 | City |
| Grantsville township | 15 | 258 | 259 | 0% | 6 | 46.02 | Township |
| Browning | 16 | 212 | 217 | -0.47% | 405 | 0.52 | City |
| Baker township | 17 | 182 | 185 | -0.55% | 4 | 46.46 | Township |
| Purdin | 18 | 139 | 141 | 0% | 454 | 0.31 | City |
| North Salem township | 19 | 111 | 111 | 0% | 3 | 44.21 | Township |
| Enterprise township | 20 | 80 | 80 | 0% | 3 | 25.16 | Township |
Brookfield township is the largest city in Linn County, with a population of 4,663.
Enterprise township is the smallest city in Linn County.
There are 20 cities in Linn County, Missouri.