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All St. Clair County population data above are from the US Census Bureau.
The population data for St. Clair County are from the Census' American Community Survey 2017 5-year estimates and the Census' 2018 Population Estimates. The demographic data for Benzie County, Berrien County, Ionia County, and Jackson County are the most current, comparable demographics available from the US Census Bureau, are from the American Community Survey 2017 5-year estimates, and were downloaded on 6 December 2018. Check out our FAQ section for more details.
With 159,337 people, St. Clair County is the 13th most populated county in the state of Michigan out of 83 counties. But watch out, St. Clair County, because Berrien County with 154,141 people and Jackson County with 158,823 people are right behind you.
The largest St. Clair County racial/ethnic groups are White (91.3%) followed by Hispanic (3.2%) and Two or More (2.4%).
In 2017, the median household income of St. Clair County residents was $53,641. St. Clair County households made slightly more than Benzie County households ($53,185) and Ionia County households ($51,980) . However, 13.3% of St. Clair County residents live in poverty.
The median age for St. Clair County residents is 43.2 years young.
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