- Census Bureau QuickFacts: Jefferson County
- Includes the county's geography, business, people, and housing facts.
- Jefferson County Chamber of Commerce
- Covers relocation information, employment opportunities and gives a membership directory.
- Jefferson County Genealogy Trails
- Provides genealogical and historical data including obituaries, cemeteries, biographies, deaths, marriage records, churches, land records, families, photos and history.
- Jefferson County Genealogy: ILGenWeb
- Genealogy research for this county includes anniversaries, births, bible records, deeds, queries and obituary files.
- National Association of Counties: Jefferson County, IL
- Offers demographic data, census facts, and list of elected officials.
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