St. Clair County MI Information


St. Clair County Subdivisions

St. Clair County MI Data & Demographics (As of July 1, 2022)


Total Population 159,207 (100%)
Population in Households 157,734 (99.1%)
Population in Families 128,308 (80.6%)
Population in Group Quarters1 1,473 ( 0.9%)
Population Density 221
Diversity Index2 24


Median Household Income $65,089
Average Household Income $88,134
% of Income for Mortgage4 17%
Per Capita Income $36,348
Wealth Index5 84


Total HU (Housing Units) 72,121 (100%)
Owner Occupied HU 52,019 (72.1%)
Renter Occupied HU 13,632 (18.9%)
Vacant Housing Units 6,470 ( 9.0%)
Median Home Value $209,501
Average Home Value $247,756
Housing Affordability Index3 132


Total Households 65,651
Average Household Size 2.40
Family Households 44,044
Average Family Size 3.00
  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.


2020-2022 2022-2027
Population -0.33% -0.15%
Households -0.05% 0.05%
Families   -0.03%
Median Household Income   3.46%
Per Capita Income   3.26%
Owner Occupied HU   0.18%


St. Clair County MI - Peer Comparisons by Rank and Percentile

The table below compares St. Clair County to the other 83 counties and county equivalents in Michigan by rank and percentile using July 1, 2022 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 # 14 84th
Population Density # 17 81st
Median Household Income # 18 80th
Housing Affordability Index # 20 24th
Per Capita Income # 17 81st
Diversity Index # 42 49th

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

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