Seabrook Island, South Carolina Demographics & Population 2026

Population Overview

Seabrook Island is a small community located in South Carolina, within Charleston County. The total population is 2,204. It ranks as the 183rd most populous out of 474 Census-designated places in South Carolina.

Age Demographics

The median age in Seabrook Island is 68.9 years. This is 71% higher than the state median of 40.2 years. Only 0.3% of residents are under 18, indicating fewer families with children. 24.9% of residents are 75 or older, suggesting a significant retirement-age population with implications for healthcare services and senior housing.

Economy, Income & Housing

The median household income in Seabrook Island is $127,500. This is 84% higher than the state median of $69,324. It is also 58% higher than the national median of $80,734. The poverty rate stands at 4.4%. This is 69% lower than the state poverty rate of 14.1%. This exceptionally low poverty rate indicates strong economic prosperity across the community. The survey records no unemployed residents in Seabrook Island, which reflects the size of the sample rather than a labor market without joblessness. The median home value is $1,001,400. Housing costs are 287% higher than the state median of $259,000. The home-value-to-income ratio of 7.9x suggests that housing affordability is a significant concern for many residents. 95.8% of occupied housing units are owner-occupied. This homeownership rate is 33% higher than the state average of 71.9%.

Race & Ethnicity

Seabrook Island has a predominantly White (non-Hispanic) population, comprising 96.1% of all residents. Hispanic or Latino residents account for 1.8%. The White (non-Hispanic) population is significantly higher than the state average (96.1% vs 61.9%). The Black or African American population (0.2%) is well below the state average of 24.6%. The Hispanic or Latino population (1.8%) is well below the state average of 7.4%. The Asian population (0.6%) is well below the state average of 1.8%.

Education

78.4% of residents aged 25 and older hold a bachelor's degree or higher. This places Seabrook Island in the top 10% of all cities in the state for educational attainment. This is 144% higher than the state rate of 32.1%. Nationally, 35.7% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 99.6%. Notably, 38.1% of adults hold a graduate or professional degree, indicating a highly educated workforce.

Data Sources & Methodology

All demographic data for Seabrook Island, South Carolina 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 South Carolina state averages and national averages calculated from the same dataset. Rankings reflect the city's position among all 474 Census-designated places in South Carolina. Read more about how these figures are produced on our methodology page, or visit data.census.gov for official data.