Seabrook, Massachusetts Demographics & Population 2026

A note before these figures: with a population of 530, Seabrook's ACS estimates come from a small number of survey responses and carry wide margins of error. Individual percentages below — particularly rates that round to 0% or 100% — are approximations, not precise measurements. See data.census.gov for the published margins of error.

Population Overview

Seabrook is a small community located in Massachusetts, within Barnstable County. The total population is 530. It ranks as the 238th most populous out of 248 Census-designated places in Massachusetts.

Age Demographics

The median age in Seabrook is 61.5 years. This is 54% higher than the state median of 40.0 years. Only 7.4% of residents are under 18, indicating fewer families with children.

Economy, Income & Housing

The median household income in Seabrook is $142,031. This is 37% higher than the state median of $103,960. It is also 76% higher than the national median of $80,734. The ACS records no residents below the poverty line in Seabrook. In a community this small the estimate rests on very few survey responses, so it should be read as an absence of measurement rather than a measured absence of poverty. The survey records no unemployed residents in Seabrook, which reflects the size of the sample rather than a labor market without joblessness. The median home value is $864,000. Housing costs are 54% higher than the state median of $562,100. The home-value-to-income ratio of 6.1x suggests that housing affordability is a significant concern for many residents. 95.5% of occupied housing units are owner-occupied. This homeownership rate is 53% higher than the state average of 62.5%.

Race & Ethnicity

Seabrook has a predominantly White (non-Hispanic) population, comprising 94.7% of all residents.

Education

66.1% of residents aged 25 and older hold a bachelor's degree or higher. This is 40% higher than the state rate of 47.3%. Nationally, 35.7% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 96.0%. Notably, 37.7% of adults hold a graduate or professional degree, indicating a highly educated workforce.

Data Sources & Methodology

All demographic data for Seabrook, Massachusetts is sourced from the U.S. Census Bureau's American Community Survey (ACS) 2020–2024 5-Year Estimates. The ACS collects data from approximately 3.5 million households annually and pools five years of responses so that even small communities can be measured, though the margin of error widens as the population falls. Comparisons are made against Massachusetts state averages and national averages calculated from the same dataset. Rankings reflect the city's position among all 248 Census-designated places in Massachusetts. Read more about how these figures are produced on our methodology page, or visit data.census.gov for official data.