17 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Cedar Rapids | 1 | 137,915 | 137,857 | 0.01% | 1,860 | 74 | City |
| Marion | 2 | 42,784 | 41,574 | 0.57% | 2,395 | 18 | City |
| Hiawatha | 3 | 7,388 | 7,180 | 0.56% | 1,550 | 5 | City |
| Mount Vernon | 4 | 4,512 | 4,542 | -0.13% | 1,291 | 3 | City |
| Robins | 5 | 3,361 | 3,366 | -0.03% | 560 | 6 | City |
| Fairfax | 6 | 2,958 | 2,851 | 0.72% | 880 | 3 | City |
| Center Point | 7 | 2,576 | 2,584 | -0.08% | 1,002 | 3 | City |
| Ely | 8 | 2,377 | 2,344 | 0.25% | 1,410 | 2 | City |
| Lisbon | 9 | 2,240 | 2,230 | 0.09% | 1,053 | 2 | City |
| Palo | 10 | 1,590 | 1,408 | 2.32% | 1,328 | 1 | City |
| Central City | 11 | 1,251 | 1,265 | -0.24% | 1,165 | 1 | City |
| Springville | 12 | 1,160 | 1,163 | -0.09% | 718 | 2 | City |
| Coggon | 13 | 688 | 702 | -0.43% | 969 | 1 | City |
| Alburnett | 14 | 671 | 675 | -0.15% | 888 | 1 | City |
| Walker | 15 | 667 | 685 | -0.6% | 891 | 1 | City |
| Bertram | 16 | 266 | 268 | -0.37% | 173 | 2 | City |
| Prairieburg | 17 | 156 | 156 | 0% | 348 | 0 | City |
Cedar Rapids is the largest city in Linn County, with a population of 137,915.
Prairieburg is the smallest city in Linn County, with a population of 156.
There are 17 cities in Linn County, Iowa.