24 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Elmira | 1 | 26,082 | 26,316 | -0.18% | 3,597 | 7.25 | City |
| Horseheads town | 2 | 18,438 | 19,297 | -0.53% | 518 | 35.61 | Town |
| Southport town | 3 | 8,760 | 9,572 | -0.82% | 189 | 46.40 | Town |
| Big Flats town | 4 | 7,407 | 7,771 | -0.76% | 167 | 44.48 | Town |
| Southport | 5 | 6,517 | 6,821 | -0.73% | 1,022 | 6.38 | CDP |
| Elmira town | 6 | 6,488 | 6,831 | -0.83% | 292 | 22.21 | Town |
| Horseheads | 7 | 6,221 | 6,585 | -1.16% | 1,598 | 3.89 | Village |
| Big Flats | 8 | 5,983 | 5,523 | 0.79% | 359 | 16.69 | CDP |
| West Elmira | 9 | 4,753 | 4,745 | -0.31% | 1,565 | 3.04 | CDP |
| Elmira Heights | 10 | 3,705 | 3,934 | -1.23% | 3,233 | 1.15 | Village |
| Veteran town | 11 | 3,195 | 3,342 | -0.62% | 83 | 38.33 | Town |
| Horseheads North | 12 | 2,673 | 2,569 | -0.41% | 1,209 | 2.21 | CDP |
| Catlin town | 13 | 2,447 | 2,535 | -0.41% | 64 | 37.99 | Town |
| Chemung town | 14 | 2,270 | 2,353 | -0.57% | 46 | 49.50 | Town |
| Erin town | 15 | 1,733 | 1,803 | -0.57% | 39 | 44.25 | Town |
| Van Etten town | 16 | 1,488 | 1,532 | -0.33% | 36 | 41.45 | Town |
| South Corning | 17 | 1,055 | 1,099 | -0.85% | 1,710 | 0.62 | Village |
| Breesport | 18 | 924 | 873 | 2.21% | 567 | 1.63 | CDP |
| Van Etten | 19 | 595 | 629 | 7.21% | 465 | 1.28 | CDP |
| Pine Valley | 20 | 558 | 493 | -2.96% | 463 | 1.20 | CDP |
| Erin | 21 | 552 | 441 | 0.91% | 739 | 0.75 | CDP |
| Wellsburg | 22 | 472 | 499 | -1.05% | 831 | 0.57 | Village |
| Riverside | 23 | 416 | 436 | -0.95% | 1,382 | 0.30 | Village |
| Millport | 24 | 272 | 289 | -1.09% | 782 | 0.35 | Village |
Elmira is the largest city in Chemung County, with a population of 26,082.
Millport is the smallest city in Chemung County.
There are 24 cities in Chemung County, New York.