There are 160 Banks & Credit Unions in St. Clair County, Illinois, serving a population of 264,433 people in an area of 658 square miles. There is 1 Bank & Credit Union per 1,652 people, and 1 Bank & Credit Union per 4 square miles.
In Illinois, St. Clair County is ranked 49th of 102 counties in Banks & Credit Unions per capita, and 10th of 102 counties in Banks & Credit Unions per square mile.