32 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Sidney town | 1 | 5,353 | 5,529 | -1.11% | 107 | 49.93 | Town |
| Delhi town | 2 | 5,161 | 4,780 | -0.29% | 80 | 64.20 | Town |
| Walton town | 3 | 5,082 | 5,255 | -1.09% | 52 | 96.83 | Town |
| Sidney | 4 | 3,629 | 3,706 | -0.41% | 1,525 | 2.38 | Village |
| Delhi | 5 | 3,411 | 2,781 | 3.84% | 1,074 | 3.18 | Village |
| Davenport town | 6 | 2,898 | 2,943 | -0.82% | 56 | 51.56 | Town |
| Walton | 7 | 2,859 | 2,918 | -0.42% | 1,854 | 1.54 | Village |
| Hancock town | 8 | 2,718 | 2,756 | -0.55% | 17 | 158.99 | Town |
| Franklin town | 9 | 2,243 | 2,285 | -0.8% | 28 | 81.25 | Town |
| Roxbury town | 10 | 2,214 | 2,246 | -0.67% | 25 | 87.11 | Town |
| West End | 11 | 2,193 | 2,199 | 0.78% | 600 | 3.65 | CDP |
| Stamford town | 12 | 1,964 | 1,993 | -0.71% | 40 | 48.51 | Town |
| Colchester town | 13 | 1,756 | 1,774 | -0.68% | 13 | 136.79 | Town |
| Kortright town | 14 | 1,500 | 1,541 | -0.99% | 24 | 62.45 | Town |
| Meredith town | 15 | 1,492 | 1,487 | -0.4% | 26 | 58.10 | Town |
| Harpersfield town | 16 | 1,399 | 1,448 | -1.13% | 33 | 42.02 | Town |
| Tompkins town | 17 | 1,249 | 1,290 | -1.03% | 13 | 98.13 | Town |
| Masonville town | 18 | 1,219 | 1,238 | -0.73% | 22 | 54.27 | Town |
| Franklin town | 19 | 1,143 | 1,146 | 0% | 7 | 169.83 | Town |
| Hamden town | 20 | 1,111 | 1,134 | -0.8% | 19 | 59.86 | Town |
| Andes town | 21 | 1,088 | 1,117 | -1% | 10 | 108.63 | Town |
| Stamford | 22 | 1,061 | 1,083 | -0.38% | 796 | 1.33 | Village |
| Hancock | 23 | 896 | 915 | -0.44% | 572 | 1.57 | Village |
| Bovina town | 24 | 633 | 660 | -1.4% | 14 | 44.26 | Town |
| Davenport Center | 25 | 524 | 263 | 2.34% | 169 | 3.10 | CDP |
| Margaretville | 26 | 459 | 528 | -2.96% | 659 | 0.70 | Village |
| Hobart | 27 | 388 | 398 | -0.51% | 779 | 0.50 | Village |
| Bloomville | 28 | 309 | 218 | 1.98% | 235 | 1.32 | CDP |
| Franklin | 29 | 275 | 280 | -0.36% | 811 | 0.34 | Village |
| Downsville | 30 | 239 | 405 | -9.81% | 54 | 4.39 | CDP |
| Fleischmanns | 31 | 226 | 233 | -0.44% | 345 | 0.66 | Village |
| Andes | 32 | 81 | 199 | -11.96% | 58 | 1.40 | CDP |
Sidney town is the largest city in Delaware County, with a population of 5,353.
Andes is the smallest city in Delaware County.
There are 32 cities in Delaware County, New York.