- Census Bureau QuickFacts: Johnson County
- Features the county household, people, housing, and business data.
- Johnson County Genealogical and Historical Society
- Provides membership information and publications for genealogy research.
- Johnson County Genealogy Trails
- Provides genealogical and historical data including obituaries, cemeteries, biographies, newspaper articles, marriages, family trees, military and death records and history.
- Johnson County Genealogy: ILGenWeb
- Offers genealogy research data that includes county history, newspapers, births, deeds and land records.
- National Association of Counties: Johnson County, IL
- Gives facts from the Census Bureau, demographic data, information about the county population, and list of elected officials.
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