Founded in 1817, Tompkins County is one of 62 counties in the state of New York. Historically, Tompkins County was formed from Cayuga County and Seneca County. The city of Ithaca is the county seat. With FIPS code of 109, Tompkins County has a population of 105,162 and area of 476 square miles (1,233 km2).
List of all cities in Tompkins County, NY alphabetically
| City/Town | Postal Code | Area Code |
| Brooktondale, NY | 14817 | 607 |
| Dryden, NY | 13053 | 607 |
| Etna, NY | 13062 | 607 |
| Freeville, NY | 13068 | 607 |
| Groton, NY | 13073 | 607 |
| Groton City, NY | 13073 | 607 |
| Ithaca, NY | 14850 | 607 |
| 14851 | 607 | |
| 14852 | 607 | |
| 14853 | 607 | |
| 14882 | 607 | |
| Ithaca College, NY | 14850 | 607 |
| Jacksonville, NY | 14854 | 607 |
| Lansing, NY | 14882 | 607 |
| McLean, NY | 13102 | 607 |
| Newfield, NY | 14867 | 607 |
| Slaterville Springs, NY | 14881 | 607 |
| Trumansburg, NY | 14886 | 607 |
| West Groton, NY | 13073 | 607 |