16 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Potosi township | 1 | 1,891 | 1,872 | 0.21% | 35 | 54.58 | Township |
| Mound City township | 2 | 1,327 | 1,309 | 0.08% | 27 | 49.25 | Township |
| Pleasanton | 3 | 1,190 | 1,212 | -0.34% | 549 | 2.17 | City |
| Linn Valley | 4 | 1,188 | 962 | 3.94% | 402 | 2.96 | City |
| Parker township | 5 | 1,038 | 1,093 | -1.05% | 41 | 25.37 | Township |
| La Cygne | 6 | 1,030 | 1,042 | -0.19% | 674 | 1.53 | City |
| Scott township | 7 | 817 | 776 | 1.11% | 13 | 62.21 | Township |
| Mound City | 8 | 643 | 647 | -0.16% | 556 | 1.16 | City |
| Paris township | 9 | 570 | 543 | 1.06% | 9 | 64.29 | Township |
| Sheridan township | 10 | 475 | 450 | 1.06% | 11 | 44.07 | Township |
| Blue Mound township | 11 | 444 | 429 | 0.68% | 7 | 62.55 | Township |
| Parker | 12 | 228 | 235 | -0.44% | 811 | 0.28 | City |
| Blue Mound | 13 | 222 | 222 | 0% | 349 | 0.64 | City |
| Prescott | 14 | 216 | 206 | 0.93% | 758 | 0.28 | City |
| Stanton township | 15 | 169 | 161 | 1.2% | 6 | 29.77 | Township |
| Valley township | 16 | 110 | 104 | 0.92% | 3 | 36.95 | Township |
Potosi township is the largest city in Linn County, with a population of 1,891.
Valley township is the smallest city in Linn County.
There are 16 cities in Linn County, Kansas.