16 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Elmira | 1 | 26,240 | 26,312 | -0.06% | 3,618 | 7 | City |
| Horseheads | 2 | 18,497 | 19,295 | -0.32% | 519 | 36 | Town |
| Southport | 3 | 8,784 | 9,577 | -0.64% | 189 | 46 | Town |
| Big Flats | 4 | 7,434 | 7,769 | -0.54% | 167 | 44 | Town |
| Elmira | 5 | 6,510 | 6,828 | -0.6% | 293 | 22 | Town |
| Horseheads | 6 | 6,280 | 6,592 | -0.99% | 1,613 | 4 | Village |
| Elmira Heights | 7 | 3,722 | 3,931 | -1.12% | 3,248 | 1 | Village |
| Veteran | 8 | 3,216 | 3,344 | -0.28% | 84 | 38 | Town |
| Catlin | 9 | 2,452 | 2,547 | -0.45% | 65 | 38 | Town |
| Chemung | 10 | 2,281 | 2,351 | -0.18% | 46 | 49 | Town |
| Erin | 11 | 1,749 | 1,806 | -0.23% | 40 | 44 | Town |
| Van Etten | 12 | 1,478 | 1,532 | -0.54% | 36 | 41 | Town |
| South Corning | 13 | 1,066 | 1,099 | -0.65% | 1,728 | 1 | Village |
| Wellsburg | 14 | 477 | 499 | -1.04% | 840 | 1 | Village |
| Riverside | 15 | 418 | 436 | -0.95% | 1,389 | 0 | Village |
| Millport | 16 | 271 | 289 | -1.45% | 779 | 0 | Village |
Elmira is the largest city in Chemung County, with a population of 26,240.
Millport is the smallest city in Chemung County, with a population of 271.
There are 16 cities in Chemung County, New York.