| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Utica | 1 | 62,511 | 65,154 | -0.74% | 3,738 | 17 | City |
| Rome | 2 | 31,663 | 31,893 | -0.06% | 423 | 75 | City |
| New Hartford | 3 | 21,889 | 21,809 | -0.26% | 861 | 25 | Town |
| Whitestown | 4 | 17,700 | 18,093 | 0.02% | 648 | 27 | Town |
| Kirkland | 5 | 9,837 | 10,077 | 0.34% | 291 | 34 | Town |
| Vernon | 6 | 8,049 | 8,294 | -0.37% | 201 | 40 | Town |
| Marcy | 7 | 7,893 | 8,796 | -4.12% | 240 | 33 | Town |
| Lee | 8 | 5,987 | 6,158 | -0.28% | 133 | 45 | Town |
| Verona | 9 | 5,832 | 5,967 | -0.05% | 84 | 69 | Town |
| Westmoreland | 10 | 5,824 | 5,915 | -0.17% | 135 | 43 | Town |
| Vienna | 11 | 5,125 | 5,253 | -0.1% | 83 | 61 | Town |
| Camden | 12 | 4,639 | 4,773 | -0.34% | 86 | 54 | Town |
| Boonville | 13 | 4,399 | 4,515 | -0.27% | 61 | 72 | Town |
| Trenton | 14 | 4,198 | 4,281 | -0.4% | 97 | 43 | Town |
| Paris | 15 | 4,168 | 4,327 | -0.5% | 132 | 31 | Town |
| Clinton | 16 | 4,093 | 4,036 | 0.27% | 107 | 38 | Town |
| Deerfield | 17 | 3,875 | 3,980 | -0.36% | 118 | 33 | Town |
| Floyd | 18 | 3,667 | 3,706 | -0.03% | 106 | 35 | Town |
| Whitesboro | 19 | 3,532 | 3,686 | -0.76% | 3,364 | 1 | Village |
| New York Mills | 20 | 3,139 | 3,267 | -0.73% | 2,660 | 1 | Village |
| Sherrill | 21 | 2,951 | 3,075 | -0.74% | 1,277 | 2 | City |
| Annsville | 22 | 2,600 | 2,645 | -0.19% | 43 | 60 | Town |
| Yorkville | 23 | 2,552 | 2,665 | -0.78% | 3,803 | 1 | Village |
| Sangerfield | 24 | 2,237 | 2,326 | -0.53% | 73 | 31 | Town |
| Camden | 25 | 2,109 | 2,194 | -0.71% | 866 | 2 | Village |
| Augusta | 26 | 2,008 | 2,019 | 0.2% | 73 | 28 | Town |
| Boonville | 27 | 1,975 | 2,037 | -0.55% | 1,142 | 2 | Village |
| Marshall | 28 | 1,904 | 1,966 | -0.31% | 58 | 33 | Town |
| New Hartford | 29 | 1,844 | 1,842 | 0.11% | 2,979 | 1 | Village |
| Western | 30 | 1,823 | 1,850 | 0.05% | 36 | 51 | Town |
| Remsen | 31 | 1,781 | 1,765 | 0.39% | 50 | 35 | Town |
| Clinton | 32 | 1,586 | 1,656 | -0.81% | 2,534 | 1 | Village |
| Bridgewater | 33 | 1,552 | 1,504 | 2.51% | 65 | 24 | Town |
| Forestport | 34 | 1,494 | 1,478 | 0.4% | 19 | 77 | Town |
| Waterville | 35 | 1,479 | 1,544 | -0.8% | 1,044 | 1 | Village |
| Oriskany | 36 | 1,330 | 1,330 | 0.08% | 1,679 | 1 | Village |
| Vernon | 37 | 1,145 | 1,181 | -0.52% | 1,210 | 1 | Village |
| Steuben | 38 | 1,119 | 1,071 | 1.08% | 26 | 43 | Town |
| Florence | 39 | 978 | 969 | 0.62% | 18 | 55 | Town |
| Sylvan Beach | 40 | 887 | 892 | -0.34% | 1,291 | 1 | Village |
| Ava | 41 | 699 | 681 | -0.14% | 19 | 38 | Town |
| Oriskany Falls | 42 | 628 | 655 | -0.79% | 1,241 | 1 | Village |
| Clinton | 43 | 624 | 647 | -0.32% | 9.0 | 67 | Town |
| Remsen | 44 | 404 | 421 | -0.74% | 1,086 | 0 | Village |
| Holland Patent | 45 | 388 | 396 | -0.51% | 767 | 1 | Village |
| Clayville | 46 | 330 | 342 | -0.6% | 752 | 0 | Village |
Utica is the largest city in Oneida County, with a population of 62,511.
Clayville is the smallest city in Oneida County, with a population of 330.
There are 46 cities in Oneida County, New York.