Seneca County, New York
County seat: Waterloo · Population 32,883 (2025) · 324 sq mi
Seneca County is the 57th most populous of New York's 62 counties, with 32,883 people (2025 estimate). Its county seat is Waterloo. The map shows its 5 cities and towns and the 6 neighboring counties.
Seneca County facts
- County seat
- Waterloo
- Population (2025 estimate)
- 32,883 −2.8% since 2020
- Land area
- 324 sq mi 53rd largest of 62
- Water area
- 67 sq mi
- Population density
- 102 per sq mi
- Established
- 1804
- Named after
- Seneca indigenous people of North America
- Largest city
- Seneca Falls 8,845
- Median household income
- $68,089
- Cities and towns
- 5 plus 2 CDPs
- ZIP codes
- 15
- Time zone
- Eastern
- FIPS code
- 36099
Cities and towns in Seneca County
Seneca County has 5 incorporated cities, towns and villages. Populations count the people living inside Seneca County; cities that cross a county line also list the other counties.
| Name | Type | Population 2025 | Also in |
|---|---|---|---|
| Waterloo (county seat) | Village | 4,674 | |
| Interlaken | Village | 606 | |
| Ovid | Village | 514 | |
| Lodi | Village | 274 | |
| Geneva | City | 63 | Ontario County |
Unincorporated communities (CDPs)
Census-designated places are communities without their own city government; the county provides their services.
| Community | Population | Also in |
|---|---|---|
| Seneca Falls | 6,956 | |
| Romulus | 265 |
ZIP codes in Seneca County
15 ZIP codes reach into Seneca County. ZIP codes ignore county lines, so some also cover a neighboring county.
- 13065
- 13146 also Wayne County
- 13148
- 13165
- 14433 also Wayne County
- 14456 also Ontario and Yates counties
- 14489 also Wayne and Ontario counties
- 14521
- 14532 also Ontario County
- 14541
- 14588
- 14841 also Schuyler County
- 14847 also Schuyler County
- 14860
- 14886 also Tompkins and Schuyler counties
Population of Seneca County, 2020–2025
Seneca County shrank by 941 people (−2.8%) between April 2020 and July 2025: 253 more deaths than births and a net loss of 661 people from migration.
| Year (July 1) | Population |
|---|---|
| 2020 | 33,445 |
| 2021 | 33,237 |
| 2022 | 32,676 |
| 2023 | 32,449 |
| 2024 | 32,671 |
| 2025 | 32,883 |
Neighboring counties
- Cayuga County northeast · 74,365 people
- Ontario County west · 113,130 people
- Yates County southwest · 24,547 people
- Wayne County north · 91,250 people
- Tompkins County southeast · 104,047 people
- Schuyler County south · 16,924 people
Printable Seneca County map
The PDF is a vector file with real text: it prints sharp on Letter paper and you can search it for a town. The PNG is 2400 pixels wide for slides and documents. Both are free to use with a credit to WhichCounty.
- PDF (Letter) (98 KB)
- PNG (2400 px) (122 KB)
Paste this code to embed the map on your site:
Sources
- Boundaries: U.S. Census Bureau, 2025 Cartographic Boundary Files (1:500,000).
- Population: Census Bureau county and city estimates, Vintage 2025. CDP populations: American Community Survey 2020–2024.
- Places and ZIP codes: Census Bureau 2026 Gazetteer and 2020 ZIP Code Tabulation Area relationship files.
- County seat, founding year and name origin: Wikidata (CC0), checked against state sources.
Back to the New York county map with all 62 counties. Found an error? Tell us.