Sullivan's Island

County:: Charleston County
County Seat:: No
Area (mi²):: 2.498
State:: South Carolina

Sullivan's Island is a town located in Charleston County, South Carolina. Sullivan's Island has a 2025 population of 1,938. Sullivan's Island is currently growing at a rate of 0.41% annually and its population has increased by 2.11% since the most recent census, which recorded a population of 1,898 in 2020.

The average household income in Sullivan's Island is $309,339 with a poverty rate of 8.32%.The median age in Sullivan's Island is 52.9 years: 48.3 years for males, and 57.7 years for females.

Demographics

The racial composition of Sullivan's Island includes 98.87% White, and smaller percentages for Two or more races, Asian and multiracial populations.

Population by Race

Race	Population	Percentage (of total)
White	2,103	98.87%
Two or more races	16	0.75%
Asian	8	0.38%

Sullivan's Island Marital Status

Married

Widowed

Divorced

Separated

Never Married

Economics and Income Statistics

Sullivan's Island's average per capita income is $85,903. Household income levels show a median of $179,614. The poverty rate stands at 8.32%.

Families: A family includes the owner or renter of the home along with everyone related to them - whether through birth, marriage, or adoption. This includes relatives like spouses, children, parents, siblings, grandparents, and any other family members.

Households: A household includes all the people who occupy a housing unit (such as a house or apartment) as their usual place of residence.

Non Families: A nonfamily household is either someone living alone or when the owner/renter lives with people they aren't related to, like roommates.

Name	Median	Mean
Families	$250,001	$388,447
Married Families	$250,001	-
Households	$179,614	$309,339
Non Families	$122,143	$133,383

$85,903

Average Income

$179,614

Median Household Income

8.32%

Poverty Rate