St. Clair County MI Information


St. Clair County Subdivisions

St. Clair County MI Data & Demographics (As of July 1, 2017)


Total Population 160,304
Daytime Population: Workers 56,026
Daytime Population: Residents 84,814
Total Daytime Population (TDP) 140,840
Ratio TDP/Total Population1 0.88
Population in Households 158,305
Population in Familes 129,592
Population in Group Qrtrs 1,999
Population Density2 222
Diversity Index3 19


Median Household Income $51,533
Average Household Income $65,275
Per Capita Income $26,077


Total Housing Units 71,964 (100%)
Owner Occupied HU 47,956 (66.6%)
Renter Occupied HU 15,269 (21.2%)
Vacant Housing Units 8,739 (12.1%)
Median Home Value $153,053
Average Home Value $183,589


Total Households 63,225
Average Household Size 2.5
Family Households 43,220
Average Family Size 3
  1. If the ratio of the TDP to Total Population is greater than 1, the location gains population during the day when commuting workers are present. If the ratio is less than 1, the location is more of a bedroom community where people commute to another place for work.
  2. Population Density = Total Population per square mile.
  3. 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 race 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.


2010-2017 2017-2022
Population -0.23% -0.2%
Households -0.13% -0.13%
Families -0.32% -0.26%
Median Household Income   1.6%
Per Capita Income   2.7%


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, 2017 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
Diversity Index # 41 52nd
Median Household Income # 19 78th
Per Capita Income # 28 67th

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