- Calhoun County Genealogy: ILGenWeb
- Provides county history and data for genealogy research. Includes cemetery index and war and military records.
- Calhoun County, Illinois
- Historical background offered for the county, with township and community maps, and civil war information.
- Calhoun County, Illinois Genealogy and History
- Provides genealogical and historical data including biographies, land records, census, obituaries, cemeteries, military, deaths, births and local history.
- Calhoun District 40
- School district offers news, board members, calendar, and links to schools.
- Census Bureau QuickFacts: Calhoun County
- Includes information about the county businesses, housing, population, and households.
- National Association of Counties: Calhoun County, IL
- Offers demographic data, census facts, and list of elected officials.
- National Register of Historical Places: Calhoun County, Illinois
- Brief information about the places with historical significance in the county. Data about the architectural style, function, and address.
- Visitors Guide to Area Attractions in Calhoun County, Illinois
- Features attractions that include Calhoun County Ferries, museums, wildlife refuge, the Joe Page Bridge and other nearby sites.
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