| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Victor | 1 | 16,688 | 15,862 | 1.62% | 465 | 36 | Town |
| Farmington | 2 | 15,191 | 14,341 | 0.03% | 385 | 39 | Town |
| Geneva | 3 | 12,465 | 12,803 | -0.69% | 2,958 | 4 | City |
| Canandaigua | 4 | 11,371 | 11,126 | 1% | 200 | 57 | Town |
| Canandaigua | 5 | 10,348 | 10,400 | 0.01% | 2,269 | 5 | City |
| Manchester | 6 | 9,178 | 9,398 | -0.51% | 243 | 38 | Town |
| Phelps | 7 | 6,537 | 6,643 | -0.34% | 101 | 65 | Town |
| Gorham | 8 | 4,089 | 4,108 | 0.05% | 84 | 49 | Town |
| Hopewell | 9 | 3,963 | 3,931 | 0.97% | 111 | 36 | Town |
| Geneva | 10 | 3,645 | 3,483 | 2.27% | 190 | 19 | Town |
| East Bloomfield | 11 | 3,599 | 3,644 | -0.42% | 108 | 33 | Town |
| Richmond | 12 | 3,259 | 3,347 | -0.49% | 77 | 42 | Town |
| Victor | 13 | 2,892 | 2,727 | -0.48% | 2,117 | 1 | Village |
| West Bloomfield | 14 | 2,717 | 2,746 | -0.22% | 107 | 25 | Town |
| Seneca | 15 | 2,579 | 2,635 | -0.46% | 51 | 50 | Town |
| Naples | 16 | 2,343 | 2,396 | -0.47% | 59 | 40 | Town |
| Bristol | 17 | 2,257 | 2,295 | -0.18% | 62 | 37 | Town |
| Clifton Springs | 18 | 2,163 | 2,203 | -0.32% | 1,460 | 1 | Village |
| Phelps | 19 | 1,847 | 1,872 | -0.16% | 1,596 | 1 | Village |
| South Bristol | 20 | 1,626 | 1,650 | -0.25% | 42 | 39 | Town |
| Manchester | 21 | 1,622 | 1,660 | -0.37% | 1,422 | 1 | Village |
| Canadice | 22 | 1,610 | 1,659 | -0.56% | 54 | 30 | Town |
| Shortsville | 23 | 1,352 | 1,391 | -0.44% | 2,143 | 1 | Village |
| Bloomfield | 24 | 1,320 | 1,354 | -0.45% | 946 | 1 | Village |
| Naples | 25 | 938 | 980 | -0.74% | 971 | 1 | Village |
Victor is the largest city in Ontario County, with a population of 16,688.
Naples is the smallest city in Ontario County, with a population of 938.
There are 25 cities in Ontario County, New York.