| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Elmira | 1 | 26,047 | 26,298 | -0.16% | 3,592 | 7 | City |
| Horseheads | 2 | 18,254 | 19,304 | -0.7% | 513 | 36 | Town |
| Southport | 3 | 8,670 | 9,578 | -0.8% | 187 | 46 | Town |
| Big Flats | 4 | 7,357 | 7,766 | -0.66% | 165 | 44 | Town |
| Elmira | 5 | 6,407 | 6,827 | -0.87% | 288 | 22 | Town |
| Horseheads | 6 | 6,208 | 6,589 | -1.07% | 1,595 | 4 | Village |
| Elmira Heights | 7 | 3,671 | 3,929 | -1.21% | 3,203 | 1 | Village |
| Veteran | 8 | 3,153 | 3,337 | -0.82% | 82 | 38 | Town |
| Catlin | 9 | 2,441 | 2,538 | -0.37% | 64 | 38 | Town |
| Chemung | 10 | 2,258 | 2,349 | -0.4% | 46 | 49 | Town |
| Erin | 11 | 1,734 | 1,806 | -0.57% | 39 | 44 | Town |
| Van Etten | 12 | 1,477 | 1,532 | -0.34% | 36 | 41 | Town |
| South Corning | 13 | 1,060 | 1,102 | -0.75% | 1,718 | 1 | Village |
| Wellsburg | 14 | 452 | 480 | -1.09% | 796 | 1 | Village |
| Riverside | 15 | 416 | 436 | -0.95% | 1,382 | 0 | Village |
| Millport | 16 | 271 | 289 | -1.09% | 779 | 0 | Village |
Elmira is the largest city in Chemung County, with a population of 26,047.
Millport is the smallest city in Chemung County, with a population of 271.
There are 16 cities in Chemung County, New York.