28 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Ithaca | 1 | 34,422 | 30,177 | 2.53% | 6,387 | 5.39 | City |
| Ithaca town | 2 | 20,783 | 18,461 | -0.53% | 718 | 28.95 | Town |
| Dryden town | 3 | 13,037 | 13,831 | -1.09% | 139 | 93.64 | Town |
| Lansing town | 4 | 11,480 | 11,594 | -0.82% | 190 | 60.49 | Town |
| South Hill | 5 | 6,598 | 6,503 | -0.08% | 1,119 | 5.90 | CDP |
| Groton town | 6 | 5,349 | 5,705 | -1.31% | 108 | 49.41 | Town |
| Newfield town | 7 | 4,762 | 5,088 | -1.24% | 81 | 58.83 | Town |
| Ulysses town | 8 | 4,581 | 4,863 | -1.21% | 139 | 32.89 | Town |
| Lansing | 9 | 3,937 | 3,732 | 1.05% | 854 | 4.61 | Village |
| Cayuga Heights | 10 | 3,827 | 4,072 | -1.26% | 2,166 | 1.77 | Village |
| Danby town | 11 | 3,249 | 3,397 | -0.79% | 61 | 53.55 | Town |
| Enfield town | 12 | 3,199 | 3,338 | -0.71% | 87 | 36.73 | Town |
| Caroline town | 13 | 3,168 | 3,318 | -0.88% | 58 | 54.77 | Town |
| Northeast Ithaca | 14 | 2,624 | 2,763 | -0.04% | 1,786 | 1.47 | CDP |
| East Ithaca | 15 | 2,111 | 2,169 | -0.38% | 985 | 2.14 | CDP |
| Groton | 16 | 2,056 | 2,201 | -1.39% | 1,184 | 1.74 | Village |
| Northwest Ithaca | 17 | 1,892 | 2,092 | 1.72% | 532 | 3.55 | CDP |
| Dryden | 18 | 1,809 | 1,943 | -1.47% | 1,030 | 1.76 | Village |
| Trumansburg | 19 | 1,627 | 1,761 | -1.63% | 1,173 | 1.39 | Village |
| Newfield | 20 | 1,428 | 772 | 7.21% | 1,136 | 1.26 | CDP |
| Forest Home | 21 | 1,241 | 877 | 3.76% | 5,516 | 0.23 | CDP |
| South Lansing | 22 | 1,138 | 944 | 7.16% | 412 | 2.76 | CDP |
| Varna | 23 | 874 | 684 | 7.11% | 1,226 | 0.71 | CDP |
| Jacksonville | 24 | 835 | 438 | 7.19% | 231 | 3.61 | CDP |
| Brooktondale | 25 | 584 | 590 | 7.16% | 2,393 | 0.24 | CDP |
| Freeville | 26 | 435 | 470 | -1.58% | 411 | 1.06 | Village |
| Danby | 27 | 398 | 199 | 7.28% | 115 | 3.46 | CDP |
| Slaterville Springs | 28 | 288 | 178 | 7.46% | 1,095 | 0.26 | CDP |
Ithaca is the largest city in Tompkins County, with a population of 34,422.
Slaterville Springs is the smallest city in Tompkins County.
There are 28 cities in Tompkins County, New York.