25 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Victor | 1 | 16,337 | 15,869 | 0.55% | 455 | 36 | Town |
| Farmington | 2 | 15,536 | 14,204 | 1.63% | 394 | 39 | Town |
| Geneva | 3 | 12,244 | 12,703 | -0.62% | 2,906 | 4 | City |
| Canandaigua | 4 | 11,692 | 11,134 | 0.92% | 206 | 57 | Town |
| Canandaigua | 5 | 10,448 | 10,532 | -0.13% | 2,291 | 5 | City |
| Manchester | 6 | 9,222 | 9,401 | -0.15% | 244 | 38 | Town |
| Phelps | 7 | 6,603 | 6,640 | 0.11% | 102 | 65 | Town |
| Gorham | 8 | 4,105 | 4,102 | 0.22% | 84 | 49 | Town |
| Hopewell | 9 | 3,906 | 3,924 | 0.21% | 109 | 36 | Town |
| East Bloomfield | 10 | 3,650 | 3,645 | 0.25% | 110 | 33 | Town |
| Geneva | 11 | 3,494 | 3,471 | 0.29% | 182 | 19 | Town |
| Richmond | 12 | 3,288 | 3,353 | -0.21% | 77 | 42 | Town |
| West Bloomfield | 13 | 2,746 | 2,747 | 0.29% | 108 | 25 | Town |
| Seneca | 14 | 2,641 | 2,641 | 0.46% | 52 | 50 | Town |
| Victor | 15 | 2,640 | 2,729 | -0.56% | 1,933 | 1 | Village |
| Naples | 16 | 2,364 | 2,400 | -0.17% | 60 | 40 | Town |
| Bristol | 17 | 2,271 | 2,283 | 0.31% | 62 | 37 | Town |
| Clifton Springs | 18 | 2,150 | 2,203 | -0.42% | 1,451 | 1 | Village |
| Phelps | 19 | 1,862 | 1,871 | -0.05% | 1,609 | 1 | Village |
| Canadice | 20 | 1,641 | 1,659 | 0% | 55 | 30 | Town |
| South Bristol | 21 | 1,629 | 1,642 | 0.18% | 42 | 39 | Town |
| Manchester | 22 | 1,614 | 1,661 | -0.49% | 1,415 | 1 | Village |
| Shortsville | 23 | 1,340 | 1,390 | -0.59% | 2,124 | 1 | Village |
| Bloomfield | 24 | 1,322 | 1,360 | -0.45% | 948 | 1 | Village |
| Naples | 25 | 942 | 978 | -0.63% | 975 | 1 | Village |
Victor is the largest city in Ontario County, with a population of 16,337.
Naples is the smallest city in Ontario County, with a population of 942.
There are 25 cities in Ontario County, New York.