8 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Northwood | 1 | 2,033 | 2,070 | -0.34% | 510 | 3.99 | City |
| Manly | 2 | 1,214 | 1,256 | -0.65% | 859 | 1.41 | City |
| Fertile | 3 | 294 | 306 | -0.68% | 312 | 0.94 | City |
| Kensett | 4 | 253 | 258 | -0.39% | 250 | 1.01 | City |
| Grafton | 5 | 208 | 217 | -0.95% | 648 | 0.32 | City |
| Joice | 6 | 200 | 210 | -0.99% | 187 | 1.07 | City |
| Hanlontown | 7 | 198 | 208 | -1% | 204 | 0.97 | City |
| Bolan | 8 | 10 | 10 | 11.11% | 32 | 0.31 | CDP |
Northwood is the largest city in Worth County, with a population of 2,033.
Bolan is the smallest city in Worth County.
There are 8 cities in Worth County, Iowa.