As of 2025 the population of St. Clair County is 9,714. The population is expected to grow to 9,903 by 2030 - a growth rate of 0.39%.
The median age of St. Clair County residents is 48.
The diversity index of St. Clair County is 18.1, meaning that there is a 18% chance that any two people selected out of 100 residents will be of different race or ethnicity from one another.
The average household income in St. Clair County is $65,195 and projected to be $69,766 in 2030. Per capita income is $27,720, projected to be $29,772 in 2030. 0.8% of households – 78 – have an income of $200,000 or higher. Average net worth is $491,776 and the average disposable income is $52,063.
There are 5,521 housing units in St. Clair County; 3,180 are owner-occupied, 946 are rented, and 1,395 are vacant. The average home value is $283,801, with 356 homes built in 2010 or later, and 777 built in 1939 or earlier.
There are 295 businesses in St. Clair County, employing 2,613 workers and pulling from a labor force of 3,782 age 16 and above. 1,735 workers commute into St. Clair County from outside the county or state. Key industries for the area include:
1,852 residents both live and work in/around St. Clair County. The average travel time is 28.8 minutes. 15.71% people have a commute of less than 5 minutes while 13.23% commute 90 minutes or more each way. Of commuters, 2,892 drive alone, 513 carpool, and 4 take public transportation. 123 use other modes of transport such as motorcycle, bicycle, walking, etc. 250 residents work from home.
3,056 members of the workforce hold a high school diploma or GED. 640 have associates degrees, 723 have bachelor’s degrees, and 310 hold a graduate or professional degree.
