- Census Bureau QuickFacts: Henderson County
- Offers facts about the county's housing, people, businesses, and geography.
- Henderson County Fair
- Features Fair Book, program of events, admission, rules and forms and details about the Fair Queen, plaque donors and the association.
- Henderson County Genealogy Trails
- Provides genealogical and historical data including obituaries, cemeteries, newspapers, old settlers and school data.
- Henderson County Genealogy: ILGenWeb
- Lists history data for genealogical research, including marriages, census reports, obituaries, births and county facts.
- Henderson County Public Library District
- Details given for location and hours, story time program, and bookmobile schedule.
- National Association of Counties: Henderson County, IL
- Presents demographic data, census facts, and list of elected officials and places in the county.
- National Register of Historical Places: Henderson County, Illinois
- Offers a list of properties, historic districts, and landmarks in the county. Information about the historic function, significance, and architectural style.
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