- Census Bureau QuickFacts: McHenry County
- Features county geography, household, population, housing, and business data.
- McHenry County
- Provides the official departments and elected officers, emergency readiness, and human services.
- McHenry County Economic Development Corporation
- A nonprofit business advocacy group comprised of business and industry investors working to encourage and develop the economic health of the county. Includes county profile data.
- McHenry County Fair
- Includes fair schedule, fair book, camping, Queen pageant, grounds map, past results, photos and directions.
- McHenry County Genealogy: ILGenWeb
- Provides county history and data for genealogy research. Includes biographies, diaries, cemetery listing by township, photos and other resources.
- McHenry County History and Genealogy
- Provides genealogical and historical data including obituaries, cemeteries, biographies, death records, census, newspaper extracts and historical resources.
- National Association of Counties: McHenry County, IL
- Features information about the county population, demographic and census data, and list of elected officials.
- National Register of Historical Places: McHenry County, Illinois
- Detailed list of places with historical significance. Information about the historic function, significance, architectural style, and builder.
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