Seneca County, New York
Seneca County: county in New York, United States
About
Seneca County is a county located in the U.S. state of New York. As of the 2010 census, the population was 35,251 and a population density of 42 people per km². After 10 years in 2020 county had an estimated population of 33,991 inhabitants. Its county seat is Waterloo (village), New York. The county was created 222 years ago in 1803.
County Snapshot
Seneca County at a glance
Seneca County currently has 10 quality-checked populated place pages linked on MapSof, making it easier to jump from the county overview into local city pages.
Mapped populated places
10
These counts use a stricter populated-place filter so the main lists stay focused on real city and town pages.
New York counties
61
Open related pagesLargest city
ThompsonPopulation 15,082
Top linked places
Quick Facts about Seneca County
| Population | 33,991 (2020) |
| Country | United States of America |
| State | New York (United States) |
| Different from | Seneca County |
| Area | 842 km2 |
| Water as percent of area | 17% |
| Land as percent of area | 83% |
| Latitude & Longitude | 42.7811,-76.8238 |
| Named for | Seneca people |
| Capital | Waterloo (village), New York |
| Establishment | January 01, 1804 |
| Time Zone | America/New_York |
| Local time | 21:02:59 (18th April 2026) |
| Density | 40 Pop. per km² as of 2020 |
| Population growth | -3.71% (2010-2020) |
| Weather | 74℉ Partly Sunny then Chance Showers And Thunderstorms 7-days weather |
Geography
Seneca County is located at 42°46'52"N 76°49'26"W (42.7810800, -76.8237800). It has 6 neighbors: Cayuga County, Ontario County, Schuyler County, Tompkins County, Wayne County and Yates County.
Seneca County map
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The largest city of Seneca County is Thompson with a population of 15,082. Other cities include, Seneca Falls population 8,611, Waterloo population 4,864, Romulus population 4,143 and Fayette population 4,028. See all Seneca County cities & populated places.
Seneca County Populated Places
Cities, towns, neighborhoods & other populated places in Seneca County.
| City Name | Population | Title |
|---|---|---|
| Thompson | 15,082 | Town in Sullivan County, New York, United States |
| Seneca Falls | 8,611 | Town in Seneca County, New York, United States of America |
| Waterloo | 4,864 | City in Seneca County, New York, United States of America |
| Romulus | 4,143 | Town in Seneca County, New York |
| Fayette | 4,028 | Town in Seneca County, New York |
| Ovid | 2,270 | City in Seneca County, New York, United States of America |
| Covert | 2,089 | Town in Seneca County, New York, USA |
| Lodi | 1,502 | Town in Seneca County, New York, United States |
| Tyre | 1,054 | Town of the United States |
| Interlaken | 599 | Village in Seneca County, New York, United States |
Weather
A chance of rain showers between 2pm and 5pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 74. South wind 10 to 20 mph,...
7-Day ForecastOfficial website of Seneca County
Official WebsiteDemographics
According to census records, the population of Seneca County decreased by 3.71% in 10 years.
| Year | Population | % Change | Method |
|---|---|---|---|
| 2010 | 35,251 | - | census |
| 2011 | 35,380 | 0.36% | estimation process |
| 2012 | 35,388 | 0.02% | estimation process |
| 2013 | 35,250 | -0.39% | estimation process |
| 2014 | 34,879 | -1.06% | estimation process |
| 2015 | 34,801 | -0.22% | estimation process |
| 2016 | 34,710 | -0.26% | estimation process |
| 2017 | 34,246 | -1.35% | estimation process |
| 2018 | 34,179 | -0.2% | estimation process |
| 2019 | 34,016 | -0.48% | estimation process |
| 2020 | 33,991 | -0.07% | estimation process |
People born in Seneca County (2)
People born in Seneca County, including architect Louise Blanchard Bethune, Union Army General Elisha Marshall, .
More notable people
Other places with the same name (1)
- Seneca County, Ohio county in New York, United States with a population of 54,938 people.
New York Other Counties (more counties)
| County Name | Population | Title |
|---|---|---|
| New York City | 8,398,748 | The most populous city in the United States and the center of the New York metropolitan area. |
| Brooklyn | 2,577,000 | A borough of New York City. |
| Queens | 2,339,150 | The most populous borough of New York City. |
| Queens County | 2,225,821 | County in New York, United States |
| Manhattan | 1,644,518 | The most densely populated borough of New York City. |
| New York County | 1,611,989 | County in New York state, United States of America |
| Suffolk County | 1,474,273 | County in New York, United States |
| The Bronx | 1,455,720 | The fourth most populous borough of New York City. |
| Bronx County | 1,401,142 | Borough of New York City, United States |
| Nassau County | 1,351,334 | County in New York, United States |
| Westchester County | 965,802 | County in New York, United States. |
| Erie County | 917,241 | County in New York, United States |
| Hempstead | 764,055 | Located in Nassau County, New York, this hamlet and village is a major commercial and transportation hub. |
| Monroe County | 740,900 | County in Florida, United States |
| Brookhaven | 479,883 | This town in Suffolk County, New York, is the most populous in the state. |
| Richmond County | 475,327 | County in Georgia, United States |