Demographics of Nassau County, New York

Nassau County, New York had 1,398,939 people on July 1, 2025, by the Census Bureau’s estimate: +7,987 since July 2020. Age, income, poverty, housing and origin below come from the American Community Survey, averaged over 2020–2024, each with its margin of error.

Nassau County, in four figures

1,398,939
Population: July 1, 2025, Vintage 2025 estimate.; +0.6%
Change since July 2020: +7,987 people.; 42.0 ±0.2
Median age: ACS 2020–⁠2024.; $146,202 ±$1,472
Median household income: ACS 2020–⁠2024, in 2024 dollars.

Population, year by year

July 1 estimates from the Census Bureau’s Vintage 2025. Each year's change is births less deaths, net moves from abroad and net moves from elsewhere in the country, with the Bureau's small residual. The 2020 row's components run 3 months, from the April census to July 1.

Nassau County, New York's population grew 0.6% from July 2020 to July 2025, against +3.1% nationally

The July 1 estimate of Nassau County, New York's resident population and the nation's, each year of the Census Bureau's Vintage 2025, as a share of its July 2020 level (= 100).

Source: The Census Bureau

About this chart

The figures

Nassau County, New York's population grew 0.6% from July 2020 to July 2025, against +3.1% nationally. The July 1 estimate of Nassau County, New York's resident population and the nation's, each year of the Census Bureau's Vintage 2025, as a share of its July 2020 level (= 100).
July 1	Population	Index	United States
2020	1,390,952	100.0	100.0
2021	1,391,787	100.1	100.2
2022	1,388,346	99.8	100.7
2023	1,388,940	99.9	101.6
2024	1,397,783	100.5	102.5
2025	1,398,939	100.6	103.1

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Population of Nassau County, New York on July 1 of each year, Vintage 2025
July 1	Population	Change	Births less deaths	From abroad	From elsewhere in the country
2020	1,390,952	−4,824	−2,267	+54	−2,534
2021	1,391,787	+835	+1,720	+1,079	−2,900
2022	1,388,346	−3,441	+2,500	+5,894	−11,801
2023	1,388,940	+594	+2,366	+8,187	−10,106
2024	1,397,783	+8,843	+2,708	+10,560	−4,473
2025	1,398,939	+1,156	+2,789	+3,483	−5,219

Age, 2020–2024

The median age is 42.0 ±0.2: for men 40.6 ±0.2 and for women 43.2 ±0.1. Shares are of everyone the survey counts, in the Bureau’s sex-by-age table (B01001).

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People in Nassau County by age, ACS 2020–2024
Age	People	Share	New York	United States
Under 5	73,174 ±75	5.3% ±<0.1	5.4% ±<0.1	5.6% ±<0.1
5 to 17	225,554 ±2,673	16.2% ±0.2	15.0% ±<0.1	16.3% ±<0.1
18 to 24	115,421 ±1,764	8.3% ±0.1	8.9% ±<0.1	9.1% ±<0.1
25 to 44	336,154 ±2,827	24.2% ±0.2	27.1% ±<0.1	26.9% ±<0.1
45 to 64	379,788 ±2,630	27.3% ±0.2	25.6% ±0.1	24.8% ±<0.1
65 and over	259,500 ±3,198	18.7% ±0.2	17.9% ±0.1	17.2% ±<0.1

Income and poverty, 2020–2024

Median household income is $146,202 ±$1,472, and income per person $64,198 ±$729, in 2024 dollars. The median is $85,974 ±$402 in New York and $80,734 ±$166 in the United States.

Households by income

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Households in Nassau County by income, ACS 2020–2024
Household income	Households	Share	New York	United States
Under $25,000	32,393 ±1,584	7.1% ±0.3	16.0% ±0.1	14.6% ±<0.1
$25,000 to $49,999	38,511 ±1,689	8.4% ±0.4	15.1% ±0.1	16.7% ±<0.1
$50,000 to $74,999	40,723 ±1,699	8.9% ±0.4	13.6% ±0.1	15.5% ±<0.1
$75,000 to $99,999	41,217 ±1,657	9.0% ±0.4	11.4% ±0.1	12.6% ±<0.1
$100,000 to $149,999	81,708 ±2,613	17.8% ±0.6	16.7% ±0.1	17.5% ±<0.1
$150,000 to $199,999	66,484 ±1,829	14.5% ±0.4	10.1% ±0.1	9.6% ±<0.1
$200,000 or more	157,130 ±2,450	34.3% ±0.5	17.1% ±0.1	13.4% ±0.1

Poverty by age

The poverty rate is the share of people whose family income is below the federal threshold for their family’s size, of everyone for whom the Bureau determines it (B17020).

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Poverty rate in Nassau County by age, ACS 2020–2024
Age	Below poverty	Rate	New York	United States
All ages	74,256 ±3,467	5.4% ±0.3	14.0% ±0.2	12.5% ±0.1
Under 18	16,808 ±1,495	5.7% ±0.5	18.3% ±0.2	16.1% ±0.1
18 to 59	35,436 ±2,040	4.9% ±0.3	12.8% ±0.1	11.6% ±0.1
60 and over	22,012 ±1,339	6.3% ±0.4	13.1% ±0.2	11.0% ±<0.1

Housing, 2020–2024

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Housing in Nassau County, ACS 2020–2024
Measure	Nassau County	New York	United States
Housing units	479,044 ±353	8,585,241 ±652	143,775,355 ±10,234
Occupied	95.6% ±0.2	90.0% ±0.1	89.9% ±0.1
Vacant	4.4% ±0.3	10.0% ±0.1	10.1% ±0.1
Owner occupied	81.9% ±0.5	54.3% ±0.2	65.2% ±0.3
Renter occupied	18.1% ±0.5	45.7% ±0.1	34.8% ±0.1
Median home value	$684,700 ±$2,833	$423,800 ±$1,627	$332,700 ±$236
Median gross rent	$2,252 ±$41	$1,621 ±$7	$1,413 ±$2
Median year built	1955 ±1	1959 ±1	1980 ±1

Occupied and vacant are shares of all housing units; owner and renter occupied are shares of occupied units. Value and rent are medians in 2024 dollars.

Origin and place of birth, 2020–2024

Hispanic or Latino origin is not a race in the Census Bureau’s tables. Here the people of Hispanic origin, of any race, are one row, and everyone else is counted by race alone (B03002), so the rows add to the whole.

Hispanic origin and race

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People in Nassau County by Hispanic origin and race, ACS 2020–2024
Origin	People	Share	New York	United States
Hispanic or Latino	260,047 ±0	18.7% ±<0.1	19.8% ±<0.1	19.3% ±<0.1
White alone, not Hispanic	753,995 ±1,446	54.3% ±0.1	52.8% ±<0.1	57.4% ±<0.1
Black alone, not Hispanic	150,236 ±2,577	10.8% ±0.2	13.4% ±<0.1	11.9% ±<0.1
Asian alone, not Hispanic	169,015 ±1,777	12.2% ±0.1	9.0% ±<0.1	5.9% ±<0.1
American Indian and Alaska Native alone, not Hispanic	574 ±182	< 0.1% ±<0.1	0.2% ±<0.1	0.5% ±<0.1
Native Hawaiian and Other Pacific Islander alone, not Hispanic	107 to 343	< 0.1%	< 0.1% ±<0.1	0.2% ±<0.1
Some other race alone, not Hispanic	14,191 ±1,872	1.0% ±0.1	1.0% ±<0.1	0.6% ±<0.1
Two or more races, not Hispanic	41,308 ±2,835	3.0% ±0.2	3.8% ±0.1	4.3% ±<0.1

A range (the estimate less and plus its margin) where the Bureau's estimate is too uncertain to state as one number: a coefficient of variation over 30%.

Place of birth and citizenship

“Born a citizen outside the states” counts people born in Puerto Rico, the island areas, or abroad to American parents. Naturalized citizens and those who are not citizens together make up the people born abroad (B05002).

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People in Nassau County by place of birth and citizenship, ACS 2020–2024
Born	People	Share	New York	United States
Born in the state	964,710 ±5,150	69.4% ±0.4	62.4% ±0.1	57.3% ±<0.1
Born in another state	76,894 ±2,298	5.5% ±0.2	12.3% ±0.1	26.9% ±<0.1
Born a citizen outside the states	24,043 ±1,768	1.7% ±0.1	2.5% ±<0.1	1.7% ±<0.1
Born abroad	323,944 ±4,773	23.3% ±0.3	22.8% ±0.1	14.1% ±<0.1
Naturalized citizens	224,591 ±4,134	16.2% ±0.3	13.6% ±0.1	7.4% ±<0.1
Not citizens	99,353 ±3,317	7.1% ±0.2	9.2% ±0.1	6.8% ±<0.1

Nassau County among the counties of New York

6th of 62 by population, July 2025. Every one is listed on the New York page.

Counties of New York near Nassau County in population, July 2025
County	July 2025	Change since 2020
Kings County	2,653,963	−2.5%
Queens County	2,358,182	−1.1%
New York County	1,664,862	−1.3%
Suffolk County	1,546,090	+1.6%
Bronx County	1,406,332	−3.8%
Nassau County	1,398,939	+0.6%
Westchester County	1,015,743	+1.4%
Erie County	946,741	−0.6%
Monroe County	750,506	−1.0%
Richmond County	501,290	+1.2%
Onondaga County	466,584	−1.9%

Elsewhere on the site

Rankings this appears in

No. 6 Counties by population in New York
No. 19 Counties by population growth in New York
No. 30 Counties by population

Sources

Census Bureau population estimates — counties and Puerto Rico municipios, with components of change — U.S. Census Bureau · U.S. Government work · retrieved September 25, 2026
American Community Survey 5-year estimates — table-based Summary File · U.S. Government work

Compiled automatically from Census Bureau population estimates — counties and Puerto Rico municipios, with components of change and American Community Survey 5-year estimates — table-based Summary File by a checked SQL query · Editor: Kian O'Connor · How this site is built

Data retrieved September 25, 2026