9 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Newton | 1 | 18,040 | 18,567 | -0.58% | 1,218 | 14.81 | City |
| Park City | 2 | 9,083 | 8,395 | 1.54% | 904 | 10.04 | City |
| Hesston | 3 | 3,457 | 3,497 | -0.23% | 970 | 3.56 | City |
| Halstead | 4 | 2,114 | 2,174 | -0.56% | 1,434 | 1.47 | City |
| North Newton | 5 | 1,771 | 1,810 | -0.45% | 1,942 | 0.91 | City |
| Sedgwick | 6 | 1,568 | 1,600 | -0.38% | 960 | 1.63 | City |
| Burrton | 7 | 829 | 863 | -0.84% | 935 | 0.89 | City |
| Walton | 8 | 216 | 221 | -0.46% | 695 | 0.31 | City |
| Furley | 9 | 62 | 25 | 6.9% | 251 | 0.25 | CDP |
Newton is the largest city in Harvey County, with a population of 18,040.
Furley is the smallest city in Harvey County.
There are 9 cities in Harvey County, Kansas.