24 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 |
| Southport | 5 | 6,517 | 6,821 | -0.73% | 1,022 | 6 | CDP |
| Elmira | 6 | 6,510 | 6,828 | -0.6% | 293 | 22 | Town |
| Horseheads | 7 | 6,280 | 6,592 | -0.99% | 1,613 | 4 | Village |
| Big Flats | 8 | 5,983 | 5,523 | 0.79% | 359 | 17 | CDP |
| West Elmira | 9 | 4,753 | 4,745 | -0.31% | 1,565 | 3 | CDP |
| Elmira Heights | 10 | 3,722 | 3,931 | -1.12% | 3,248 | 1 | Village |
| Veteran | 11 | 3,216 | 3,344 | -0.28% | 84 | 38 | Town |
| Horseheads North | 12 | 2,673 | 2,569 | -0.41% | 1,209 | 2 | CDP |
| Catlin | 13 | 2,452 | 2,547 | -0.45% | 65 | 38 | Town |
| Chemung | 14 | 2,281 | 2,351 | -0.18% | 46 | 49 | Town |
| Erin | 15 | 1,749 | 1,806 | -0.23% | 40 | 44 | Town |
| Van Etten | 16 | 1,478 | 1,532 | -0.54% | 36 | 41 | Town |
| South Corning | 17 | 1,066 | 1,099 | -0.65% | 1,728 | 1 | Village |
| Breesport | 18 | 924 | 873 | 2.21% | 567 | 2 | CDP |
| Van Etten | 19 | 595 | 629 | 7.21% | 465 | 1 | CDP |
| Pine Valley | 20 | 558 | 493 | -2.96% | 463 | 1 | CDP |
| Erin | 21 | 552 | 441 | 0.91% | 739 | 1 | CDP |
| Wellsburg | 22 | 477 | 499 | -1.04% | 840 | 1 | Village |
| Riverside | 23 | 418 | 436 | -0.95% | 1,389 | 0 | Village |
| Millport | 24 | 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 24 cities in Chemung County, New York.