Charleston County SC Information


Charleston County Subdivisions

Charleston County SC Data & Demographics (As of July 1, 2020)


Total Population 418,819 (100%)
Population in Households 407,964 (97.4%)
Population in Families 300,447 (71.7%)
Population in Group Quarters1 10,855 ( 2.6%)
Population Density 457
Diversity Index2 56


Median Household Income $65,405
Average Household Income $98,454
% of Income for Mortgage4 21%
Per Capita Income $40,755
Wealth Index5 116


Total HU (Housing Units) 200,975 (100%)
Owner Occupied HU 101,232 (50.4%)
Renter Occupied HU 71,532 (35.6%)
Vacant Housing Units 28,211 (14.0%)
Median Home Value $320,653
Average Home Value $430,949
Housing Affordability Index3 123


Total Households 172,764
Average Household Size 2.36
Family Households 100,222
Average Family Size 3
  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 1.76% 1.65%
Households 1.77% 1.68%
Families 1.54% 1.53%
Median Household Income   1.86%
Per Capita Income   2.25%
Owner Occupied HU   1.32%


Charleston County SC - Peer Comparisons by Rank and Percentile

The table below compares Charleston County to the other 46 counties and county equivalents 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 # 3 96th
Population Density # 3 96th
Median Household Income # 2 98th
Housing Affordability Index # 2 4th
Per Capita Income # 1 100th
Diversity Index # 14 72nd

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

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Compare South Carolina July 1, 2020 Data
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  5. See the South Carolina COVID-19 Data and US COVID-19 Data for more information on the spread of the novel coronavirus.