28 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Ithaca | 1 | 34,665 | 30,180 | 2.66% | 6,433 | 5 | City |
| Ithaca | 2 | 20,881 | 18,465 | -1.57% | 721 | 29 | Town |
| Dryden | 3 | 13,475 | 13,836 | 0.06% | 144 | 94 | Town |
| Lansing | 4 | 12,118 | 11,589 | 1.41% | 200 | 60 | Town |
| South Hill | 5 | 6,598 | 6,503 | -0.08% | 1,119 | 6 | CDP |
| Groton | 6 | 5,531 | 5,702 | -0.14% | 112 | 49 | Town |
| Ulysses | 7 | 4,939 | 4,858 | 2.07% | 150 | 33 | Town |
| Newfield | 8 | 4,918 | 5,089 | -0.08% | 84 | 59 | Town |
| Lansing | 9 | 3,934 | 3,728 | 1.05% | 853 | 5 | Village |
| Cayuga Heights | 10 | 3,917 | 4,075 | -0.81% | 2,217 | 2 | Village |
| Danby | 11 | 3,360 | 3,399 | 0.36% | 63 | 54 | Town |
| Enfield | 12 | 3,302 | 3,343 | 0.3% | 90 | 37 | Town |
| Caroline | 13 | 3,269 | 3,317 | 0.15% | 60 | 55 | Town |
| Northeast Ithaca | 14 | 2,624 | 2,763 | -0.04% | 1,786 | 1 | CDP |
| East Ithaca | 15 | 2,111 | 2,169 | -0.38% | 985 | 2 | CDP |
| Groton | 16 | 2,109 | 2,199 | -0.85% | 1,214 | 2 | Village |
| Northwest Ithaca | 17 | 1,892 | 2,092 | 1.72% | 532 | 4 | CDP |
| Dryden | 18 | 1,860 | 1,942 | -0.91% | 1,059 | 2 | Village |
| Trumansburg | 19 | 1,794 | 1,757 | 0.39% | 1,293 | 1 | Village |
| Newfield | 20 | 1,428 | 772 | 7.21% | 1,136 | 1 | CDP |
| Forest Home | 21 | 1,241 | 877 | 3.76% | 5,516 | 0 | CDP |
| South Lansing | 22 | 1,138 | 944 | 7.16% | 412 | 3 | CDP |
| Varna | 23 | 874 | 684 | 7.11% | 1,226 | 1 | CDP |
| Jacksonville | 24 | 835 | 438 | 7.19% | 231 | 4 | CDP |
| Brooktondale | 25 | 584 | 590 | 7.16% | 2,393 | 0 | CDP |
| Freeville | 26 | 449 | 474 | -1.1% | 424 | 1 | Village |
| Danby | 27 | 398 | 199 | 7.28% | 115 | 3 | CDP |
| Slaterville Springs | 28 | 288 | 178 | 7.46% | 1,095 | 0 | CDP |
Ithaca is the largest city in Tompkins County, with a population of 34,665.
Slaterville Springs is the smallest city in Tompkins County, with a population of 288.
There are 28 cities in Tompkins County, New York.