- Census Bureau QuickFacts: Madison County
- Features data covering businesses, geography, people, and housing in the county.
- Madison County Fair
- Features facts, schedule, exhibitors, entertainment, arena events and what's new at the fair this year.
- Madison County Genealogy: ILGenWeb
- Presents history information for genealogical research for this county that includes local history records, census, deaths, pioneer stories and surnames.
- Madison County Government
- Passage to the official departments, county board and officers, and community development of the county.
- Madison County History and Genealogy
- Provides genealogical and historical data including obituaries, cemeteries, biographies, military data, census, newspapers and historical resources.
- National Association of Counties: Madison County, IL
- General information about the county, demographic and census data, and list of elected officials.
- National Register of Historical Places: Madison County, Illinois
- Features a list of individual historic destinations and districts in the county. Also gives information about their significance, function, architectural style, builder, owner, and address.
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