| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Newton | 1 | 18,286 | 18,576 | -0.37% | 1,235 | 15 | City |
| Hesston | 2 | 3,454 | 3,495 | -0.12% | 969 | 4 | City |
| Halstead | 3 | 2,124 | 2,174 | -0.38% | 1,441 | 1 | City |
| North Newton | 4 | 1,786 | 1,817 | -0.28% | 1,958 | 1 | City |
| Sedgwick | 5 | 1,570 | 1,600 | -0.32% | 961 | 2 | City |
| Burrton | 6 | 830 | 863 | -0.72% | 936 | 1 | City |
| Walton | 7 | 213 | 223 | -0.93% | 685 | 0 | City |
Newton is the largest city in Harvey County, with a population of 18,286.
Walton is the smallest city in Harvey County, with a population of 213.
There are 7 cities in Harvey County, Kansas.