Town · New Hampshire
Seabrook, New Hampshire
Seabrook, town, in Rockingham County, New Hampshire. Seabrook had 8,430 residents on July 1, 2025 by the Census Bureau's estimate, up 0.3% since 2020; the 2020 Census counted 8,401 and the ACS 2020-2024 5-year estimates put it at 8,427 (±18). GEOID 3301568260.
Residents, July 2025 estimate
8,430
Census Bureau estimate (no margin published)
2020 Census count: 8,401 · ACS 2020-2024: 8,427 ±18
Median household income
$84,349
±$15,363 (90% margin)
New Hampshire: $99,031
Median home value
$443,500
±$40,438 (90% margin)
New Hampshire: $402,500
Median gross rent
$1,542
±$174 (90% margin)
New Hampshire: $1,491
Where is Seabrook and what county is it in?
Seabrook is a town in Rockingham County, New Hampshire. It covers 9.0 square miles of land, 936 residents per square mile in 2020.
One place lies inside Seabrook: Seabrook Beach (CDP, 1,078 in 2020).
Seabrook is in the Boston-Cambridge-Newton, MA-NH metropolitan statistical area, which takes in 7 counties (Census Bureau delineation, July 2023).
Source: 2024 Gazetteer and 2020 place-by-county files, U.S. Census Bureau · Census reference files
How many people live in Seabrook, and is it growing?
The Census Bureau estimates that 8,430 people lived in Seabrook on July 1, 2025, up 0.3% since 2020, slower than New Hampshire (+2.7%). The 2020 Census counted 8,401 residents. The 2020-2024 American Community Survey, a five-year sample, puts the population at 8,427 (±18).
| Measure | Seabrook | Rockingham County | Change since 2015-2019 |
|---|---|---|---|
| Total population | 8,427±18 | 319,082 | −403 |
| Households | 3,823±220 | 127,570 | no clear change |
| Average household size | 2.20±0.12 | 2.48 | no clear change |
| Housing units | 4,151±241 | 137,794 | −622 |
Seabrook's population since 2000
From 7,934 in 2000 to 8,430 in 2025: up 6.3%. The 2000, 2010 and 2020 figures are census counts, each for Seabrook as it was drawn that year: a place that annexed land, or a community that has since incorporated, covered a different area then. The 2005 figure is the Census Bureau's intercensal estimate, revised to fit the 2000 and 2010 counts and drawn on 2010 boundaries; 2015 and 2025 are July 1 estimates made from the census before them.
Source: The 2000, 2010 and 2020 Census counts and the Census Bureau's population estimates (intercensal 2000-2010, Vintage 2020, Vintage 2025) · Census population estimates
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 Seabrook?
The median resident of Seabrook is 54.0 years old; 14.8% are under 18 and 31.5% are 65 or older. The largest group is non-Hispanic white residents at 87.3%, then non-Hispanic residents of two or more races at 5.9%. 2.8% of residents were born outside the United States.
| Measure | Seabrook | Rockingham County | Change since 2015-2019 |
|---|---|---|---|
| Median age | 54.0±1.9 | 45.0 | no clear change |
| Under 18 years | 14.8%±3.4 pts | 18.5% | – |
| 65 years and over | 31.5%±3.8 pts | 20.4% | – |
| Male | 50.8%±3.0 pts | 49.7% | – |
| Hispanic or Latino (any race) | 4.7%±3.2 pts | 3.7% | – |
| White alone, not Hispanic | 87.3%±4.7 pts | 89.5% | −7.3 pts |
| Black or African American alone, not Hispanic | 1.1%±1.4 pts | 0.7% | – |
| Asian alone, not Hispanic | 1.0%±0.8 pts | 1.9% | – |
| American Indian and Alaska Native alone, not Hispanic | 0.0%±0.4 pts | 0.1% | – |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0%±0.4 pts | 0.0% | – |
| Two or more races, not Hispanic | 5.9%±3.2 pts | 3.6% | – |
| Some other race alone, not Hispanic | 0.0%±0.4 pts | 0.5% | – |
| Born outside the United States | 2.8%±1.7 pts | 5.2% | no clear change |
| Speak a language other than English at home (age 5+) | 5.6%±2.7 pts | 6.5% | – |
| Civilian veterans (age 18+) | 10.7%±2.3 pts | 7.3% | – |
| With a disability | 17.1%±3.8 pts | 11.5% | – |
| No health insurance coverage | 6.1%±3.0 pts | 4.1% | no clear change |
| High school graduate or higher (age 25+) | 92.5%±3.2 pts | 96.1% | – |
| Bachelor's degree or higher (age 25+) | 27.5%±5.0 pts | 45.7% | +9.3 pts |
| Graduate or professional degree (age 25+) | 6.5%±2.0 pts | 17.2% | – |
| Lived in the same house a year earlier | 89.8%±4.0 pts | 91.5% | – |
| Moved from another state in the past year | 5.6%±3.5 pts | 3.2% | – |
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 Seabrook earn?
Half of Seabrook's 3,823 households earn less than $84,349 a year (±$15,363), against $118,331 in Rockingham County and $99,031 in New Hampshire. In 2015-2019 it was $89,795 in 2024 dollars; the margins of error cannot tell the two periods apart. 12.1% of residents live below the poverty line.
| Measure | Seabrook | Rockingham County | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $84,349±$15,363 | $118,331 | no clear change |
| Mean household income | $108,739±$16,072 | $149,721 | – |
| Per capita income | $48,681±$6,059 | $61,558 | no clear change |
| People below the poverty line | 12.1%±3.7 pts | 4.8% | +7.3 pts |
| Children under 18 below the poverty line | 18.4%±14.7 pts | 4.6% | – |
| Households receiving SNAP | 8.4%±3.2 pts | 3.3% | – |
| Households with a computer | 92.6%±3.3 pts | 97.3% | – |
| Households with a broadband subscription | 90.5%±3.5 pts | 95.0% | – |
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 Seabrook?
Owners occupy 68.2% of Seabrook's occupied homes and renters 31.8%. The median owner-occupied home is valued at $443,500 by its owner (±$40,438). The median renter pays $1,542 a month including utilities, and 44.0% of renters pay 35% or more of their income on rent.
| Measure | Seabrook | Rockingham County | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $443,500±$40,438 | $497,500 | +$107,767 |
| Median gross rent | $1,542±$174 | $1,687 | no clear change |
| Renters paying 35% or more of income on rent | 44.0%±12.1 pts | 39.7% | no clear change |
| Median monthly owner costs, with a mortgage | $2,378±$233 | $2,669 | – |
| Owner-occupied homes | 68.2%±5.1 pts | 78.4% | no clear change |
| Renter-occupied homes | 31.8%±5.1 pts | 21.6% | – |
| Housing units | 4,151±241 | 137,794 | −622 |
| Homeowner vacancy rate | 0.0%±1.3 pts | 0.5% | – |
| Rental vacancy rate | 0.0%±2.8 pts | 3.9% | – |
| Single-family detached homes | 48.6%±5.7 pts | 65.2% | – |
| Mobile homes | 18.5%±4.2 pts | 4.4% | – |
| Built 2020 or later | 1.0%±0.7 pts | 1.9% | – |
| Built 2010 to 2019 | 9.4%±3.7 pts | 8.6% | – |
| Built 1939 or earlier | 5.0%±2.3 pts | 12.5% | – |
| Households with no vehicle | 6.0%±3.4 pts | 3.1% | – |
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 many new homes is Seabrook building?
Builders took permits for 12 new housing units in Seabrook in 2025 (8 in single-family houses), 1.4 per 1,000 residents against 3.6 across New Hampshire.
Counts of units in permits a local office issued; not every permitted unit is built. A year marked with months was reported for part of the year.
Source: Building Permits Survey, annual place files 2019-2025, U.S. Census Bureau · Census Building Permits Survey
How do people in Seabrook work and get to work?
78.4% of Seabrook's workers drive alone and 10.5% work from home. The average trip to work takes 20.8 minutes. The unemployment rate in 2020-2024 averaged 6.9%.
| Measure | Seabrook | Rockingham County | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 55.3%±5.2 pts | 67.9% | – |
| Unemployment rate | 6.9%±3.9 pts | 3.6% | no clear change |
| Drove alone to work | 78.4%±5.6 pts | 72.1% | – |
| Carpooled | 5.6%±2.4 pts | 5.5% | – |
| Public transportation | 0.3%±0.5 pts | 0.4% | – |
| Walked | 2.9%±2.4 pts | 1.3% | – |
| Worked from home | 10.5%±3.9 pts | 19.4% | +6.5 pts |
| Mean travel time to work | 20.8 min±2.1 | 28.9 min | −5.3 min |
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 Seabrook?
3 census tracts lie mostly in Seabrook, and 1 more reaches into it (2020 census blocks). Their median household incomes run from $81,765 (Tract 630.01) to $102,969 (Tract 630.04).
| Tract | Residents, 2020-2024 | Median household income |
|---|---|---|
| Tract 630.03Rockingham County | 3,822 | $83,634 |
| Tract 630.01Rockingham County | 3,706 | $81,765 |
| Tract 630.04Rockingham County | 899 | $102,969 |
| Tract 640Rockingham County | 2,328 | $166,157 |
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 Seabrook) · Census block assignment files
How does Seabrook compare with other places in New Hampshire?
By the Census Bureau's July 2025 estimates, Seabrook is the 1,468th-most populous of the 16,079 U.S. towns and townships that have one and the 25th-most populous of 221 in New Hampshire.
Seabrook ranks 158th of 235 places in New Hampshire with 1,000 or more residents and a reliable estimate, by median household income.
| Measure | Rank | Of |
|---|---|---|
| Population, July 2025 estimate | 25th | 221 |
| Growth 2020-2025 (PEP) | 161st | 187 |
| Residents per square mile | 33rd | 241 |
| Median household income | 158th | 235 |
| Per capita income | 125th | 240 |
| Median home value | 64th | 239 |
| Median gross rent | 69th | 221 |
| Poverty rate | 34th | 160 |
| Bachelor's degree or higher | 186th | 239 |
| Median age | 33rd | 239 |
| Owner-occupied share | 181st | 241 |
| Work from home | 173rd | 214 |
| Travel time to work | 212th | 241 |
Seabrook's figures with every place in New Hampshire (CSV)
Every place in New Hampshire, sortable · Compare Seabrook 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 Seabrook?
12 of the 57 figures for Seabrook 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 Seabrook 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.