Nassau County, New York Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 6th-largest in New York
The population of Nassau County, New York is 1,388,138 as of the 2023 American Community Survey, making it the 6th-largest county in New York. The median household income is $143,408, the median home value is $658,700, and the median age is 41.8.
The population of Nassau County has grown 3.8% since 2010 (1,341,642 → 1,392,438), a +0.27% annualized rate.
1,388,138
Population
+0.27%
Annual growth
4878
People / sq mi
$143,408
Median Income
$658,700
Median Home Value
Nassau County covers 285 sq mi of land at 4878.5 people per square mile.
About Nassau County, NY
Nassau County is a county in New York with a population of 1,388,138. It ranks #6 among counties in New York by population. The median age is 41.8, older than the national median. The population is 49.2% male and 50.8% female.
The median household income in Nassau County is $143,408, above the US median of $74,580. 3.5% of residents live below the federal poverty level. Home values sit at a median of $658,700, with monthly rent averaging $2,195. The homeownership rate of 81.9% is higher than the national rate of 64.8%.
Educational attainment in Nassau County reflects 48.7% of adults 25 and older holding a bachelor's degree or higher, above the national average of 34.3%. Roughly 13.8% of workers primarily work from home, similar to the national work-from-home rate of 14.2%. The average commute is 36.0 minutes each way.
Nassau County Population History (2010-2024)
The county of Nassau County had a population of 1,341,642 in 2010 and 1,392,438 in 2024, a 3.8% growth over 14 years. The peak was 1,392,438 in 2024. Average annual growth rate: 0.27%.
1,392,438
Population (2024)
1,341,642
Population (2010)
1,392,438
Peak (2024)
0.27%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 1,341,642 |
| 2011 | 1,346,207 |
| 2012 | 1,349,753 |
| 2013 | 1,352,355 |
| 2014 | 1,354,851 |
| 2015 | 1,354,987 |
| 2016 | 1,356,067 |
| 2017 | 1,357,260 |
| 2018 | 1,357,423 |
| 2019 | 1,356,073 |
| 2020 | 1,390,584 |
| 2021 | 1,392,058 |
| 2022 | 1,386,825 |
| 2023 | 1,386,052 |
| 2024 | 1,392,438 |
Race & Ethnicity
| White | 59.4% |
| Black or African American | 11.4% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 0.9% |
| Two or More Races | 0.0% |
Age & Sex
41.8
Median Age
50.8%
Female
49.2%
Male
18.2%
Age 65+
Age Distribution
Children (under 15): 17.6% · Seniors (65+): 18.2%
Income & Poverty
| Median household income | $143,408+$58,830 vs state |
| Mean household income | $187,735 |
| Per-capita income | $62,743 |
| Poverty rate | 3.5%-6.3% vs state |
| Unemployment rate | 3.1% |
| Employment-to-population | 62.1% |
Top Industries by Employment
The largest employment sector in Nassau County is professional & business services, accounting for 31.1% of workers.
How residents commute
13.0%
Drive alone
2.1%
Carpool
62.2%
Public transit
13.8%
Work from home
36.0 min
Avg commute
Housing
$658,700+$255,700 vs state
Median home value
$2,195
Median rent
81.9%
Homeownership rate
477,860
Total housing units
95.4%
Occupied
4.6%
Vacant
18.1%
Renter-occupied
Social & access
96.1%
With health insurance
96.2%
With broadband internet
5.6%
Foreign-born
3.1%
Veterans (18+)
9.1%
With a disability
69.8%
Speak language other than English at home
Education
92.1%
High School+
48.7%
Bachelor's+
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County rankings
Common questions about Nassau County, NY
Frequently Asked Questions
Nassau County, New York has a population of 1,388,138 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 6th-largest county in New York. Population density is 4878 people per square mile.
The population of Nassau County has grown 3.8% since 2010 (1,341,642 → 1,392,438), a +0.27% annualized rate.
The median household income in Nassau County, New York is $143,408, with mean (average) household income of $187,735 and per-capita income of $62,743. 3.5% of residents live below the federal poverty level.
In Nassau County, the largest racial and ethnic groups are White (59.4%), Black or African American (11.4%), Hispanic or Latino (0.9%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in Nassau County, New York is 41.8 years. Residents are 50.8% female and 49.2% male.
The median home value in Nassau County is $658,700 and median monthly rent is $2,195. 81.9% of occupied housing units are owner-occupied. The county has 477,860 total housing units, 4.6% of which are vacant.
The largest employment sector in Nassau County, New York is professional, scientific, and management services, employing 31.1% of workers. The unemployment rate is 3.1%.
New York is among the largest cities associated with Nassau 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.