25 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Sullivan town | 1 | 14,581 | 14,784 | -0.22% | 199 | 73.13 | Town |
| Oneida | 2 | 9,945 | 10,317 | -0.74% | 451 | 22.05 | City |
| Lenox town | 3 | 8,548 | 8,748 | -0.37% | 236 | 36.27 | Town |
| Cazenovia town | 4 | 6,664 | 6,729 | -0.07% | 133 | 49.94 | Town |
| Hamilton town | 5 | 6,390 | 6,377 | 0.08% | 154 | 41.37 | Town |
| Chittenango | 6 | 4,757 | 4,889 | -0.54% | 1,915 | 2.48 | Village |
| Canastota | 7 | 4,403 | 4,550 | -0.65% | 1,318 | 3.34 | Village |
| Hamilton | 8 | 4,098 | 4,102 | -0.02% | 1,643 | 2.49 | Village |
| Eaton town | 9 | 3,955 | 4,282 | 0% | 89 | 44.63 | Town |
| Cazenovia | 10 | 2,719 | 2,769 | -0.37% | 1,441 | 1.89 | Village |
| Madison town | 11 | 2,710 | 2,751 | -0.26% | 66 | 40.79 | Town |
| Brookfield town | 12 | 2,235 | 2,245 | -0.04% | 29 | 77.81 | Town |
| Stockbridge town | 13 | 1,936 | 1,986 | -0.46% | 61 | 31.53 | Town |
| Nelson town | 14 | 1,880 | 1,889 | -0.16% | 44 | 43.06 | Town |
| Lincoln town | 15 | 1,812 | 1,826 | -0.11% | 73 | 24.96 | Town |
| Fenner town | 16 | 1,621 | 1,640 | -0.06% | 52 | 31.05 | Town |
| Lebanon town | 17 | 1,309 | 1,320 | -0.08% | 30 | 43.34 | Town |
| DeRuyter town | 18 | 1,249 | 1,279 | -0.4% | 41 | 30.41 | Town |
| Morrisville | 19 | 1,123 | 1,635 | -8.33% | 1,097 | 1.02 | Village |
| Smithfield town | 20 | 1,098 | 1,111 | -0.09% | 45 | 24.44 | Town |
| Georgetown town | 21 | 653 | 651 | 0.15% | 16 | 40.08 | Town |
| Oneida Castle | 22 | 576 | 593 | -0.52% | 1,138 | 0.51 | Village |
| Wampsville | 23 | 563 | 562 | 0% | 550 | 1.02 | Village |
| Munnsville | 24 | 440 | 454 | -0.68% | 502 | 0.88 | Village |
| Madison | 25 | 308 | 318 | -0.65% | 646 | 0.48 | Village |
Sullivan town is the largest city in Madison County, with a population of 14,581.
Madison is the smallest city in Madison County.
There are 25 cities in Madison County, New York.