46 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Utica | 1 | 63,281 | 65,173 | -0.6% | 3,784 | 17 | City |
| Rome | 2 | 32,015 | 31,888 | 0.08% | 428 | 75 | City |
| New Hartford | 3 | 22,121 | 21,809 | 0.06% | 870 | 25 | Town |
| Whitestown | 4 | 17,716 | 18,082 | -0.39% | 649 | 27 | Town |
| Kirkland | 5 | 9,759 | 9,921 | 0.25% | 289 | 34 | Town |
| Marcy | 6 | 8,609 | 8,791 | -0.46% | 262 | 33 | Town |
| Vernon | 7 | 8,152 | 8,299 | 0.04% | 203 | 40 | Town |
| Lee | 8 | 6,054 | 6,158 | 0.17% | 134 | 45 | Town |
| Westmoreland | 9 | 5,907 | 5,922 | 0.34% | 137 | 43 | Town |
| Verona | 10 | 5,860 | 5,963 | -0.02% | 85 | 69 | Town |
| Vienna | 11 | 5,143 | 5,257 | 0% | 84 | 61 | Town |
| Camden | 12 | 4,720 | 4,778 | 0.38% | 87 | 54 | Town |
| Boonville | 13 | 4,430 | 4,512 | -0.07% | 62 | 72 | Town |
| Trenton | 14 | 4,270 | 4,288 | 0.45% | 98 | 43 | Town |
| Paris | 15 | 4,214 | 4,326 | -0.09% | 134 | 31 | Town |
| Clinton | 16 | 4,088 | 4,034 | 0.27% | 107 | 38 | Town |
| Deerfield | 17 | 3,920 | 3,978 | 0.03% | 119 | 33 | Town |
| Floyd | 18 | 3,728 | 3,723 | 0.65% | 108 | 35 | Town |
| Whitesboro | 19 | 3,574 | 3,681 | -0.61% | 3,404 | 1 | Village |
| New York Mills | 20 | 3,179 | 3,267 | -0.56% | 2,694 | 1 | Village |
| Sherrill | 21 | 2,977 | 3,074 | -0.67% | 1,288 | 2 | City |
| Annsville | 22 | 2,599 | 2,635 | -0.04% | 43 | 60 | Town |
| Yorkville | 23 | 2,576 | 2,655 | -0.62% | 3,839 | 1 | Village |
| Sangerfield | 24 | 2,272 | 2,330 | -0.09% | 74 | 31 | Town |
| Camden | 25 | 2,137 | 2,196 | -0.56% | 877 | 2 | Village |
| Augusta | 26 | 2,031 | 2,021 | 0.59% | 73 | 28 | Town |
| Boonville | 27 | 1,997 | 2,035 | -0.4% | 1,155 | 2 | Village |
| Marshall | 28 | 1,923 | 1,959 | 0.1% | 59 | 33 | Town |
| New Hartford | 29 | 1,870 | 1,849 | 0.21% | 3,021 | 1 | Village |
| Western | 30 | 1,809 | 1,828 | 0.22% | 35 | 51 | Town |
| Remsen | 31 | 1,785 | 1,762 | 0.85% | 50 | 35 | Town |
| Clinton | 32 | 1,629 | 1,679 | -0.61% | 2,602 | 1 | Village |
| Waterville | 33 | 1,502 | 1,550 | -0.66% | 1,061 | 1 | Village |
| Forestport | 34 | 1,497 | 1,477 | 0.74% | 19 | 77 | Town |
| Bridgewater | 35 | 1,472 | 1,504 | -0.14% | 62 | 24 | Town |
| Oriskany | 36 | 1,351 | 1,338 | 0.15% | 1,706 | 1 | Village |
| Vernon | 37 | 1,153 | 1,175 | -0.43% | 1,219 | 1 | Village |
| Steuben | 38 | 1,117 | 1,077 | 1.36% | 26 | 43 | Town |
| Florence | 39 | 965 | 962 | 0.63% | 18 | 55 | Town |
| Sylvan Beach | 40 | 885 | 894 | -0.23% | 1,288 | 1 | Village |
| Ava | 41 | 708 | 680 | 1.29% | 19 | 38 | Town |
| Oriskany Falls | 42 | 637 | 655 | -0.62% | 1,259 | 1 | Village |
| Clinton | 43 | 624 | 649 | -0.64% | 9 | 67 | Town |
| Remsen | 44 | 411 | 424 | -0.72% | 1,105 | 0 | Village |
| Holland Patent | 45 | 394 | 398 | -0.25% | 779 | 1 | Village |
| Clayville | 46 | 334 | 341 | -0.6% | 761 | 0 | Village |
Utica is the largest city in Oneida County, with a population of 63,281.
Clayville is the smallest city in Oneida County, with a population of 334.
There are 46 cities in Oneida County, New York.