| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Anamosa | 1 | 6,005 | 5,449 | 1.76% | 2,379 | 3 | City |
| Monticello | 2 | 4,113 | 4,050 | 0.22% | 731 | 6 | City |
| Olin | 3 | 655 | 656 | -0.15% | 641 | 1 | City |
| Wyoming | 4 | 530 | 529 | 0% | 1,093 | 0 | City |
| Oxford Junction | 5 | 427 | 429 | -0.23% | 659 | 1 | City |
| Martelle | 6 | 248 | 250 | -0.4% | 797 | 0 | City |
| Onslow | 7 | 196 | 198 | -0.51% | 1,010 | 0 | City |
| Morley | 8 | 94 | 94 | 0% | 1,093 | 0 | City |
Anamosa is the largest city in Jones County, with a population of 6,005.
Morley is the smallest city in Jones County, with a population of 94.
There are 8 cities in Jones County, Iowa.