- Census Bureau QuickFacts: Hamilton County
- Offers geography, population, household, and business facts pertaining to the county.
- Hamilton County Genealogy
- Offers genealogy lookups, surname research, and general information.
- Hamilton County History and Genealogy
- Provides genealogical and historical data including obituaries, cemeteries, land records, schools, churches, marriage records and history.
- Hamilton County, Illinois Genealogy: ILGenWeb
- Presents history information for genealogical research that includes census, county history, photos and links to other resources.
- National Association of Counties: Hamilton County, IL
- Gives information regarding population, demographic data, and census facts. With contact details for the county officials.
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