30 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Victor town | 1 | 16,270 | 15,872 | 0.66% | 453 | 35.92 | Town |
| Farmington town | 2 | 14,965 | 14,205 | 0.71% | 380 | 39.43 | Town |
| Geneva | 3 | 12,183 | 12,702 | -0.85% | 2,891 | 4.21 | City |
| Canandaigua town | 4 | 11,750 | 11,128 | 1.6% | 207 | 56.82 | Town |
| Canandaigua | 5 | 10,442 | 10,537 | -0.18% | 2,290 | 4.56 | City |
| Manchester town | 6 | 9,144 | 9,405 | -0.79% | 242 | 37.82 | Town |
| Phelps town | 7 | 6,468 | 6,644 | -0.81% | 100 | 64.95 | Town |
| Gorham town | 8 | 4,044 | 4,101 | -0.44% | 83 | 48.85 | Town |
| Hopewell town | 9 | 3,853 | 3,929 | -0.46% | 108 | 35.68 | Town |
| East Bloomfield town | 10 | 3,561 | 3,640 | -0.7% | 107 | 33.20 | Town |
| Geneva town | 11 | 3,405 | 3,471 | -0.79% | 177 | 19.22 | Town |
| Richmond town | 12 | 3,269 | 3,353 | -0.67% | 77 | 42.43 | Town |
| West Bloomfield town | 13 | 2,688 | 2,748 | -0.67% | 106 | 25.46 | Town |
| Victor | 14 | 2,634 | 2,729 | -0.72% | 1,928 | 1.37 | Village |
| Seneca town | 15 | 2,595 | 2,642 | -0.27% | 52 | 50.31 | Town |
| Naples town | 16 | 2,333 | 2,399 | -0.68% | 59 | 39.70 | Town |
| Bristol town | 17 | 2,234 | 2,285 | -0.45% | 61 | 36.69 | Town |
| Clifton Springs | 18 | 2,145 | 2,205 | -0.56% | 1,447 | 1.48 | Village |
| Phelps | 19 | 1,845 | 1,872 | -0.27% | 1,595 | 1.16 | Village |
| Canadice town | 20 | 1,627 | 1,662 | -0.55% | 55 | 29.85 | Town |
| Manchester | 21 | 1,609 | 1,663 | -0.68% | 1,410 | 1.14 | Village |
| South Bristol town | 22 | 1,593 | 1,640 | -0.75% | 41 | 38.97 | Town |
| Shortsville | 23 | 1,348 | 1,395 | -0.66% | 2,136 | 0.63 | Village |
| Bloomfield | 24 | 1,282 | 1,322 | -0.62% | 919 | 1.40 | Village |
| Naples | 25 | 939 | 979 | -0.84% | 972 | 0.97 | Village |
| Honeoye | 26 | 815 | 671 | 1.88% | 655 | 1.25 | CDP |
| Crystal Beach | 27 | 772 | 693 | 1.18% | 1,132 | 0.68 | CDP |
| Port Gibson | 28 | 607 | 859 | 1.85% | 490 | 1.24 | CDP |
| Gorham | 29 | 438 | 762 | -2.67% | 218 | 2.01 | CDP |
| Hall | 30 | 324 | 314 | 2.53% | 317 | 1.02 | CDP |
Victor town is the largest city in Ontario County, with a population of 16,270.
Hall is the smallest city in Ontario County.
There are 30 cities in Ontario County, New York.