Census-designated place · New York
Seaford, New York
Seaford, census-designated place, in Nassau County, New York. Seaford had 15,549 people in the ACS 2020-2024 5-year estimates (±1,330). GEOID 3666058.
Residents, 2020-2024
15,549
±1,330 (90% margin)
2020 Census count: 15,251
Median household income
$172,557
±$19,177 (90% margin)
New York: $85,974
Median home value
$658,300
±$16,196 (90% margin)
New York: $423,800
Median gross rent
$2,489
±$860 (90% margin)
New York: $1,621
Where is Seaford and what county is it in?
Seaford is a census-designated place: an unincorporated community the Census Bureau draws for counting, with no city government of its own, in Nassau County, New York. It covers 2.6 square miles of land, 5,843 residents per square mile in 2020.
Seaford is in the New York-Newark-Jersey City, NY-NJ metropolitan statistical area, which takes in 22 counties (Census Bureau delineation, July 2023).
Seaford lies entirely within the Town of Hempstead, a town with its own local government (2020 census blocks).
Source: 2024 Gazetteer and 2020 place-by-county files, U.S. Census Bureau · Census reference files
How many people live in Seaford, and is it growing?
The 2020-2024 American Community Survey puts Seaford's population at 15,549 (±1,330). The 2020 Census counted 15,251 residents.
The Census Bureau publishes yearly population estimates for incorporated places only; Seaford is a census-designated place, so its figures come from the ACS and the 2020 Census.
| Measure | Seaford | Nassau County | Change since 2015-2019 |
|---|---|---|---|
| Total population | 15,549 ±1,330 | 1,389,591 | no clear change |
| Households | 5,227 ±356 | 458,166 | no clear change |
| Average household size | 2.96 ±0.13 | 2.99 | no clear change |
| Housing units | 5,389 ±352 | 479,044 | no clear change |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); Census PEP Vintage 2025 (SUB-EST2025, CO-EST2025); 2020 Census P.L. 94-171 · Check it at data.census.gov
Who lives in Seaford?
The median resident of Seaford is 40.3 years old; 21.9% are under 18 and 17.3% are 65 or older. The largest group is non-Hispanic white residents at 82.0%, then Hispanic or Latino residents (of any race) at 8.4%. 7.4% of residents were born outside the United States.
| Measure | Seaford | Nassau County | Change since 2015-2019 |
|---|---|---|---|
| Median age | 40.3 ±2.5 | 42.0 | no clear change |
| Under 18 years | 21.9% ±1.7 pts | 21.5% | – |
| 65 years and over | 17.3% ±2.6 pts | 18.7% | – |
| Male | 49.2% ±2.0 pts | 49.2% | – |
| Hispanic or Latino (any race) | 8.4% ±2.7 pts | 18.7% | no clear change |
| White alone, not Hispanic | 82.0% ±4.5 pts | 54.3% | −9.0 pts |
| Black or African American alone, not Hispanic | 3.5% ±3.2 pts | 10.8% | – |
| Asian alone, not Hispanic | 4.0% ±3.2 pts | 12.2% | – |
| American Indian and Alaska Native alone, not Hispanic | 0.1% ±0.1 pts | 0.0% | – |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0% ±0.3 pts | 0.0% | – |
| Two or more races, not Hispanic | 1.1% ±0.6 pts | 3.0% | – |
| Some other race alone, not Hispanic | 0.9% ±0.8 pts | 1.0% | – |
| Born outside the United States | 7.4% ±2.2 pts | 23.3% | no clear change |
| Speak a language other than English at home (age 5+) | 10.9% ±3.4 pts | 30.7% | – |
| Civilian veterans (age 18+) | 5.2% ±1.4 pts | 3.0% | – |
| With a disability | 8.2% ±1.7 pts | 9.4% | – |
| No health insurance coverage | 2.3% ±1.0 pts | 3.8% | no clear change |
| High school graduate or higher (age 25+) | 97.3% ±1.3 pts | 92.2% | – |
| Bachelor's degree or higher (age 25+) | 46.0% ±3.6 pts | 49.7% | no clear change |
| Graduate or professional degree (age 25+) | 19.9% ±3.5 pts | 22.8% | – |
| Lived in the same house a year earlier | 97.1% ±1.4 pts | 93.5% | – |
| Moved from another state in the past year | 0.2% ±0.2 pts | 0.6% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profiles DP02, DP05) · Check it at data.census.gov
What do households in Seaford earn?
Half of Seaford's 5,227 households earn less than $172,557 a year (±$19,177), against $146,202 in Nassau County and $85,974 in New York. In 2015-2019 it was $164,024 in 2024 dollars; the margins of error cannot tell the two periods apart. 3.6% of residents live below the poverty line.
| Measure | Seaford | Nassau County | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $172,557 ±$19,177 | $146,202 | no clear change |
| Mean household income | $195,178 ±$15,967 | $191,704 | – |
| Per capita income | $66,578 ±$5,734 | $64,198 | no clear change |
| People below the poverty line | 3.6% ±1.5 pts | 5.4% | no clear change |
| Children under 18 below the poverty line | 3.9% ±3.3 pts | 5.7% | – |
| Households receiving SNAP | 1.8% ±1.4 pts | 5.0% | – |
| Households with a computer | 97.3% ±1.5 pts | 96.5% | – |
| Households with a broadband subscription | 93.5% ±3.1 pts | 94.8% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What does housing cost in Seaford?
Owners occupy 92.9% of Seaford's occupied homes and renters 7.1%. The median owner-occupied home is valued at $658,300 by its owner (±$16,196). The median renter pays $2,489 a month including utilities, and 51.0% of renters pay 35% or more of their income on rent.
| Measure | Seaford | Nassau County | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $658,300 ±$16,196 | $684,700 | +$65,229 |
| Median gross rent | $2,489 ±$860 | $2,252 | no clear change |
| Renters paying 35% or more of income on rent | 51.0% ±25.5 pts | 45.5% | no clear change |
| Median monthly owner costs, with a mortgage | $3,581 ±$321 | $3,795 | – |
| Owner-occupied homes | 92.9% ±3.3 pts | 81.9% | no clear change |
| Renter-occupied homes | 7.1% ±3.3 pts | 18.1% | – |
| Housing units | 5,389 ±352 | 479,044 | no clear change |
| Homeowner vacancy rate | 1.4% ±1.8 pts | 0.7% | – |
| Rental vacancy rate | 0.0% ±10.9 pts | 4.5% | – |
| Single-family detached homes | 93.5% ±2.6 pts | 76.1% | – |
| Mobile homes | 0.7% ±0.9 pts | 0.2% | – |
| Built 2020 or later | 0.3% ±0.4 pts | 0.8% | – |
| Built 2010 to 2019 | 4.2% ±1.7 pts | 3.2% | – |
| Built 1939 or earlier | 11.1% ±3.8 pts | 19.2% | – |
| Households with no vehicle | 1.4% ±1.1 pts | 6.8% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP04) · Check it at data.census.gov
How do people in Seaford work and get to work?
63.3% of Seaford's workers drive alone and 13.0% work from home. The average trip to work takes 38.4 minutes. The unemployment rate in 2020-2024 averaged 3.7%.
| Measure | Seaford | Nassau County | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 68.4% ±2.8 pts | 64.8% | – |
| Unemployment rate | 3.7% ±1.8 pts | 4.8% | no clear change |
| Drove alone to work | 63.3% ±4.6 pts | 60.7% | – |
| Carpooled | 7.0% ±3.1 pts | 7.3% | – |
| Public transportation | 15.1% ±4.6 pts | 12.5% | – |
| Walked | 1.1% ±0.9 pts | 2.0% | – |
| Worked from home | 13.0% ±3.3 pts | 15.6% | +10.4 pts |
| Mean travel time to work | 38.4 min ±3.4 | 36.0 min | no clear change |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What census tracts are in Seaford?
3 census tracts lie mostly in Seaford, and 1 more reaches into it (2020 census blocks). Their median household incomes run from $152,750 (Tract 4161) to $191,318 (Tract 5227).
| Tract | Residents, 2020-2024 | Median household income |
|---|---|---|
| Tract 4161Nassau County | 6,424 | $152,750 |
| Tract 5227Nassau County | 4,992 | $191,318 |
| Tract 4160Nassau County | 4,133 | $185,795 |
| Tract 4169Nassau County | 3,449 | $147,105 |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); 2020 block assignment files (tract share = share of the tract's census blocks in Seaford) · Census block assignment files
How does Seaford compare with other places in New York?
Seaford ranks 94th of 1,623 places in New York with 1,000 or more residents and a reliable estimate, by median household income.
| Measure | Rank | Of |
|---|---|---|
| Population (ACS 2020-2024) | 222nd | 1,657 |
| Residents per square mile | 116th | 1,657 |
| Median household income | 94th | 1,623 |
| Per capita income | 219th | 1,653 |
| Median home value | 205th | 1,637 |
| Median gross rent | 108th | 1,515 |
| Poverty rate | 1,250th | 1,331 |
| Bachelor's degree or higher | 427th | 1,640 |
| Median age | 1,171st | 1,654 |
| Owner-occupied share | 154th | 1,639 |
| Work from home | 637th | 1,350 |
| Travel time to work | 116th | 1,652 |
Seaford's figures with every place in New York (CSV)
Every place in New York, sortable · Compare Seaford with other places
Source: PlainCities ranks computed from the American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) and PEP Vintage 2025 · How ranks are computed
How reliable are the figures for Seaford?
14 of the 57 figures for Seaford on this page carry a coefficient of variation over 40% and are marked with a ring: they come from a small sample, so read them as rough.
The American Community Survey samples about one household in eight over five years, so every figure is an estimate with a 90% margin of error (shown under each value). A ring marks an estimate whose coefficient of variation is over 40%. A change is called only when the gap between the two periods is larger than their combined 90% margin (the square root of the sum of the two squared margins), the Census Bureau's test. How to read a margin of error.
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026): margins of error as published · ACS technical documentation
How these figures are made: methodology and release checks · reading a margin of error · every state · corrections
Not on this page: crime, weather and schools for Seaford are other agencies' records. Crime: the FBI's Crime Data Explorer · climate: NOAA's U.S. Climate Normals · schools: the National Center for Education Statistics' school search.