- Cass County
- Official portal advertises community life, local industries and business opportunities.
- Cass County Genealogy: ILGenWeb
- Resource for county genealogy research that includes area history, surnames and vital records.
- Cass County History and Genealogy
- Offers county history, biographies, farmer's directories, newspaper articles, photos, census and obituary information.
- Census Bureau QuickFacts: Cass County
- Includes population, housing, businesses, and geography information pertaining to the county.
- National Association of Counties: Cass County, IL
- Presents information about the county population, demographic and census data, and list of elected officials.
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