- Belle Clair Fairgrounds Park
- Offers details about year-round events, including the county fair, flea market, RV and Camper show and other events.
- Census Bureau QuickFacts: St. Clair County
- Offers business, population, geography, and household data pertaining to the county.
- National Association of Counties: St. Clair County, IL
- Features information about the county population, demographic and census data, and list of elected officials.
- National Register of Historical Places: St. Clair County, Illinois
- Directory of places with historical significance. Brief information about the historic function, significance, architectural style, and builder.
- St. Clair County
- Includes tax information, county ordinances, services, and meeting schedules and minutes.
- St. Clair County Genealogy: ILGenWeb
- Project compiles genealogy and history resources including county history, online databases, census and pensioners list.
- St. Clair County History and Genealogy
- Provides genealogical and historical data including obituaries, cemeteries, biographies, census, maps and history, church records, naturalization records, military and newspapers.
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