Webthis report, produced in collaboration with the st. Clair county criminal justice coordinating council, profiles the county's criminal justice system and outlines. Submit a crime tip ; Sign up for alerts ; Download our app ;. Clair county detention center inmate roster. Click current inmates to view inmates currently at the st. Clair county detention center. Click 48 hour release to view all. Submit a crime tip ; Sign up for alerts ; Download our app ;. Clair county, located in southwestern illinois on the missouri border, is the 9th largest county in illinois with an estimated population of 262,479 residents in 2017. Webit brings together nine key reports that fall under this category.
