- Census Bureau QuickFacts: Mason County
- Provides facts about the county's geography, housing, population, and businesses.
- Mason County
- Directory of counties services, courthouse, meetings and agendas.
- Mason County Genealogy: ILGenWeb
- Lists history data for genealogical research, including cemeteries, surnames, military links and additional resources.
- Mason County Illinois History and Genealogy
- Provides genealogical and historical data including obituaries, cemeteries, biographies, death records, census, newspapers and historical resources.
- National Association of Counties: Mason County, IL
- Directory of elected county officials, demographic information, census facts, and list of place names in the county.
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