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St. Clair County, Illinois
Economic data, workforce demographics, business environment, and development opportunities in St. Clair County.
County Overview
St. Clair County is located in Illinois with a population of 251,018.
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Data Sources: Information compiled from U.S. Census Bureau, Bureau of Labor Statistics, county economic development offices, and local chambers of commerce. Data is subject to change. For site-specific analysis and current incentives, contact our team.