8 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Northwood | 1 | 2,042 | 2,065 | -0.24% | 512 | 4 | City |
| Manly | 2 | 1,227 | 1,255 | -0.49% | 868 | 1 | City |
| Fertile | 3 | 298 | 306 | -0.67% | 317 | 1 | City |
| Kensett | 4 | 255 | 258 | -0.39% | 252 | 1 | City |
| Grafton | 5 | 210 | 217 | -0.94% | 654 | 0 | City |
| Joice | 6 | 204 | 211 | -0.97% | 191 | 1 | City |
| Hanlontown | 7 | 198 | 205 | -1% | 204 | 1 | City |
| Bolan | 8 | 10 | 10 | 11.11% | 32 | 0 | CDP |
Northwood is the largest city in Worth County, with a population of 2,042.
Bolan is the smallest city in Worth County, with a population of 10.
There are 8 cities in Worth County, Iowa.