Seabrook Island, SC Profile: Facts & Data


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Seabrook Island, South Carolina - Basic Facts

The Town of Seabrook Island had a population of 1,930 as of July 1, 2020. Seabrook Island ranks in the lower quartile for Diversity Index when compared to the other cities, towns and Census Designated Places (CDPs) in South Carolina. See peer rankings below.

The primary coordinate point for Seabrook Island is located at latitude 32.5771 and longitude -80.1707 in Charleston County. The formal boundaries for the Town of Seabrook Island encompass a land area of 5.98 sq. miles and a water area of 1.02 sq. miles. Charleston County is in the Eastern time zone (GMT -5). The elevation is 7 feet.

The Town of Seabrook Island (GNIS ID: 2407303) has a C1 Census Class Code which indicates an active incorporated place that does not serve as a county subdivision equivalent. It also has a Functional Status Code of "A" which identifies an active government providing primary general-purpose functions.

South Carolina is one of 20 states where Census County Divisions (CCDs) are used for statistical tracking of subdivisions within each county. The Town of Seabrook Island is located within Kiawah Island-Seabrook Island Division of Charleston County.


Seabrook Island, SC Data & Demographics (As of July 1, 2020)


Total Population 1,930 (100%)
Population in Households 1,930 (100.0%)
Population in Families 1,565 (81.1%)
Population in Group Quarters1 0
Population Density 323
Diversity Index2 8


Median Household Income $121,602
Average Household Income $178,490
% of Income for Mortgage4 23%
Per Capita Income $94,974
Wealth Index5 371


Total HU (Housing Units) 2,465 (100%)
Owner Occupied HU 926 (37.6%)
Renter Occupied HU 102 ( 4.1%)
Vacant Housing Units 1,438 (58.3%)
Median Home Value $661,985
Average Home Value $811,015
Housing Affordability Index3 115


Total Households 1,027
Average Household Size 1.88
Family Households 712
Average Family Size 2
  1. Group Quarters - a place where people live or stay in a group living arrangement. Includes college residents halls, nursing facilities, military barracks, and correctional facilities.
  2. The Diversity Index is a scale of 0 to 100 that represents the likelihood that two persons, chosen at random from the same area, belong to different races or ethnic groups. If an area's entire population belongs to one race AND one ethnic group, then the area has zero diversity. An area's diversity index increases to 100 when the population is evenly divided into two or more race/ethnic groups.
  3. The Housing Affordability Index base is 100 and represents a balance point where a resident with a median household income can normally qualify to purchase a median price home. Values above 100 indicate increased affordability, while values below 100 indicate decreased affordability.
  4. The % of Income for Mortgage quantifies the percentage of median household income dedicated to mortgage payments on a home priced at the median value (assuming a 30-year mortgage and a 20% down payment).
  5. The Wealth Index is based on a number of indicators of affluence including average household income and average net worth, but it also includes the value of material possessions and resources. It represents the wealth of the area relative to the national level. Values above or below 100 represent above-average wealth or below-average wealth compared to the national level.


2010-2020 2020-2025
Population 1.16% 1.15%
Households 1.11% 1.1%
Families 0.94% 0.99%
Median Household Income   1.1%
Per Capita Income   1.41%
Owner Occupied HU   1.08%


Seabrook Island, SC - Peer Comparisons by Rank and Percentile

The table below compares Seabrook Island to the other 397 incorporated cities, towns and CDPs in South Carolina by rank and percentile using July 1, 2020 data. The location Ranked # 1 has the highest value. A location that ranks higher than 75% of its peers would be in the 75th percentile of the peer group.

Variable Description Rank Percentile
Total Population # 189 53rd
Population Density # 283 29th
Median Household Income # 3 99th
Housing Affordability Index # 36 9th
Per Capita Income # 2 100th
Diversity Index # 394 1st

Additional comparisons and rankings can be made with a VERY EASY TO USE South Carolina Census Data Comparison Tool.

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