In 2018, St. Clair County, MO had a population of 9.38k people with a median age of 49.9 and a median household income of $38,470. Between 2017 and 2018 the population of St. Clair County, MO declined from 9,396 to 9,383, a -0.138% decrease and its median household income grew from $35,066 to $38,470, a 9.71% increase.
The 5 largest ethnic groups in St. Clair County, MO are White (Non-Hispanic) (94.5%), Two+ (Non-Hispanic) (2.58%), White (Hispanic) (1.21%), Black or African American (Non-Hispanic) (0.746%), and American Indian & Alaska Native (Non-Hispanic) (0.735%). NaNk% of the people in St. Clair County, MO speak a non-English language, and 99.6% are U.S. citizens.
The median property value in St. Clair County, MO is $83,600, and the homeownership rate is 77.7%. Most people in St. Clair County, MO commute by Drove Alone, and the average commute time is 25.7 minutes. The average car ownership in St. Clair County, MO is 2 cars per household.