7 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Newton | 1 | 18,193 | 18,573 | -0.35% | 1,229 | 15 | City |
| Hesston | 2 | 3,474 | 3,498 | -0.12% | 974 | 4 | City |
| Halstead | 3 | 2,129 | 2,174 | -0.33% | 1,444 | 1 | City |
| North Newton | 4 | 1,789 | 1,816 | -0.22% | 1,962 | 1 | City |
| Sedgwick | 5 | 1,573 | 1,599 | -0.25% | 963 | 2 | City |
| Burrton | 6 | 837 | 863 | -0.48% | 944 | 1 | City |
| Walton | 7 | 215 | 223 | -0.46% | 691 | 0 | City |
Newton is the largest city in Harvey County, with a population of 18,193.
Walton is the smallest city in Harvey County, with a population of 215.
There are 7 cities in Harvey County, Kansas.