Seneca County, New York Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 57th-largest in New York
The population of Seneca County, New York is 33,125 as of the 2023 American Community Survey, making it the 57th-largest county in New York. The median household income is $66,007, the median home value is $142,700, and the median age is 42.8.
The population of Seneca County has declined 7.4% since 2010 (35,271 → 32,650), a -0.55% annualized rate.
33,125
Population
-0.55%
Annual growth
102
People / sq mi
$66,007
Median Income
$142,700
Median Home Value
Seneca County covers 324 sq mi of land at 102.3 people per square mile.
About Seneca County, NY
Seneca County is distinguished by its share of foreign-born residents, 16.5% of the population. Seneca County is a county in New York with a population of 33,125.
The typical household here earns about $66,007, below the US median of $78,538. Poverty runs at 7.3%, below the national 12.4%. Homes carry a median value of $142,700, with typical rent around $925.
Roughly 24.1% of adults have a bachelor’s, below the national 35.0%. Around 7.9% of workers work from home, below the national 14.0%, and the average commute runs about 22 minutes each way.
Seneca County Population History (2010-2024)
The county of Seneca County had a population of 35,271 in 2010 and 32,650 in 2024, a -7.4% growth over 14 years. The peak was 35,354 in 2012. Average annual growth rate: -0.55%.
32,650
Population (2024)
35,271
Population (2010)
35,354
Peak (2012)
-0.55%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 35,271 |
| 2011 | 35,325 |
| 2012 | 35,354 |
| 2013 | 35,244 |
| 2014 | 34,891 |
| 2015 | 34,814 |
| 2016 | 34,725 |
| 2017 | 34,293 |
| 2018 | 34,277 |
| 2019 | 34,189 |
| 2020 | 33,512 |
| 2021 | 33,411 |
| 2022 | 32,610 |
| 2023 | 32,416 |
| 2024 | 32,650 |
Race & Ethnicity
| White | 89.4% |
| Black or African American | 3.8% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 0.8% |
| Two or More Races | 0.0% |
Age & Sex
42.8
Median Age
48.3%
Female
51.7%
Male
20.8%
Age 65+
Age Distribution
Children (under 15): 17.0% · Seniors (65+): 20.8%
Income & Poverty
| Median household income | $66,007$-18,571 vs state |
| Mean household income | $86,730 |
| Per-capita income | $36,170 |
| Poverty rate | 7.3%-2.5% vs state |
| Unemployment rate | 2.7% |
| Employment-to-population | 54.2% |
Top Industries by Employment
The largest employment sector in Seneca County is professional & business services, accounting for 26.5% of workers.
How residents commute
0.4%
Drive alone
3.0%
Carpool
75.2%
Public transit
7.9%
Work from home
21.5 min
Avg commute
Housing
$142,700$-260,300 vs state
Median home value
$925
Median rent
72.0%
Homeownership rate
16,148
Total housing units
84.7%
Occupied
15.3%
Vacant
28.0%
Renter-occupied
Social & access
91.3%
With health insurance
90.6%
With broadband internet
16.5%
Foreign-born
8.7%
Veterans (18+)
18.0%
With a disability
92.2%
Speak language other than English at home
Education
84.6%
High School+
24.1%
Bachelor's+
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County rankings
Frequently Asked Questions
Seneca County, New York has a population of 33,125 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 57th-largest county in New York. Population density is 102 people per square mile.
The population of Seneca County has declined 7.4% since 2010 (35,271 → 32,650), a -0.55% annualized rate.
The median household income in Seneca County, New York is $66,007, with mean (average) household income of $86,730 and per-capita income of $36,170. 7.3% of residents live below the federal poverty level.
In Seneca County, the largest racial and ethnic groups are White (89.4%), Black or African American (3.8%), Hispanic or Latino (0.8%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in Seneca County, New York is 42.8 years. Residents are 48.3% female and 51.7% male.
The median home value in Seneca County is $142,700 and median monthly rent is $925. 72.0% of occupied housing units are owner-occupied. The county has 16,148 total housing units, 15.3% of which are vacant.
The largest employment sector in Seneca County, New York is professional, scientific, and management services, employing 26.5% of workers. The unemployment rate is 2.7%.
New York is among the largest cities associated with Seneca County, New York, with a population of 8,516,202.
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Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.