Charleston County SC Information


Charleston County Subdivisions

Charleston County SC Data & Demographics (As of July 1, 2021)


Total Population 423,084 (100%)
Population in Households 412,215 (97.4%)
Population in Families 302,429 (71.5%)
Population in Group Quarters1 10,869 ( 2.6%)
Population Density 462
Diversity Index2 52


Median Household Income $70,067
Average Household Income $101,495
% of Income for Mortgage4 21%
Per Capita Income $42,059
Wealth Index5 115


Total HU (Housing Units) 203,339 (100%)
Owner Occupied HU 104,684 (51.5%)
Renter Occupied HU 70,377 (34.6%)
Vacant Housing Units 28,278 (13.9%)
Median Home Value $353,559
Average Home Value $474,359
Housing Affordability Index3 119


Total Households 175,061
Average Household Size 2.35
Family Households 101,337
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.


2010-2021 2021-2026
Population 1.69% 1.69%
Households 1.73% 1.74%
Families 1.5% 1.59%
Median Household Income   2.19%
Per Capita Income   2.22%
Owner Occupied HU   1.7%


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, 2021 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 # 2 98th
Population Density # 3 96th
Median Household Income # 2 98th
Housing Affordability Index # 1 2nd
Per Capita Income # 2 98th
Diversity Index # 32 33rd

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

Quick & Easy Ways to...

  1. Get Current Demographic Data for Cities, Towns, and ZIP Codes
  2. View Boundary Maps, for Cities, Towns, and ZIP Codes
  3. Locate Physical, Cultural, and Historical Features

South Carolina Census Data Comparison Tool

Compare South Carolina July 1, 2021 Data
Highest or Lowest:

More Tools and Resources:

  1. For information about schools and school attendance zones, use the HTL Address Tool
  2. Our new HTL Neighborhood Explorer provides lots of detail about any neighborhood.
  3. The new 2-Minute Introduction and Concise Guide to Big Data which will help you make the most effective use of HomeTownLocator Tools.
  4. See the References & Data Sources page for more information about methodology and sources of data.