- Census Bureau QuickFacts: McDonough County
- Includes details about the county households, businesses, housing, people, and geography.
- McDonough County Genealogy: ILGenWeb
- Research project for county genealogy records includes historical data, vital records and census.
- McDonough County History and Genealogy
- Provides genealogical and historical data including obituaries, cemeteries, biographies, death records, census, newspaper extracts and historical resources.
- McDonough County Sheriff's Office
- Furnishes the offices information and patrol details, DARE program, and crime stoppers.
- National Association of Counties: McDonough County, IL
- Information about the county, list of elected officials, demographic and census data.
- National Register of Historical Places: McDonough County, Illinois
- Gives a list of properties, historic districts, and landmarks in the county. Information about the historic function, significance, and architectural style.
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