24 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual 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 |
| Emma | 3 | 3,988 | 4,051 | -0.52% | 111 | 36.06 | Township |
| Hesston | 4 | 3,457 | 3,497 | -0.23% | 970 | 3.56 | City |
| Newton | 5 | 2,175 | 2,233 | -0.64% | 95 | 22.83 | Township |
| Halstead | 6 | 2,114 | 2,174 | -0.56% | 1,434 | 1.47 | City |
| North Newton | 7 | 1,771 | 1,810 | -0.45% | 1,942 | 0.91 | City |
| Sedgwick | 8 | 1,708 | 1,752 | -0.64% | 48 | 35.76 | Township |
| Sedgwick | 9 | 1,568 | 1,600 | -0.38% | 960 | 1.63 | City |
| Burrton | 10 | 1,009 | 1,043 | -0.59% | 28 | 35.95 | Township |
| Burrton | 11 | 829 | 863 | -0.84% | 935 | 0.89 | City |
| Walton | 12 | 697 | 709 | 0.14% | 22 | 31.69 | Township |
| Darlington | 13 | 535 | 547 | -0.37% | 15 | 35.46 | Township |
| Macon | 14 | 492 | 503 | -0.4% | 14 | 34.28 | Township |
| Walton | 15 | 468 | 479 | -0.64% | 13 | 36.68 | Township |
| Pleasant | 16 | 437 | 435 | 0.23% | 12 | 36.03 | Township |
| Halstead | 17 | 407 | 411 | -0.49% | 12 | 35.37 | Township |
| Richland | 18 | 370 | 379 | -0.8% | 10 | 36.35 | Township |
| Walton | 19 | 316 | 309 | 0.64% | 6 | 53.50 | Township |
| Garden | 20 | 290 | 292 | 0% | 8 | 36.08 | Township |
| Alta | 21 | 227 | 228 | 0% | 6 | 35.93 | Township |
| Walton | 22 | 216 | 221 | -0.46% | 695 | 0.31 | City |
| Lake | 23 | 154 | 160 | -1.28% | 4 | 35.78 | Township |
| Furley | 24 | 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, with a population of 62.
There are 24 cities in Harvey County, Kansas.