- Census Bureau QuickFacts: Grundy County
- Features the county's population data, household, geographic, and business details.
- Grundy County Agricultural District Fair
- Supplies background information for this 100 year old agricultural event.
- Grundy County Fair
- Features fair schedules, entertainment, exhibitions, racing, Miss Grundy County Fair Queen pageant and directions.
- Grundy County Genealogy: ILGenWeb
- Offers genealogy research data including biographies, court records, coal mining, vital records, directories, newspapers and other resources.
- Grundy County History and Genealogy
- Provides genealogical and historical data including obituaries, cemeteries, deaths, newspapers, history, and census data.
- National Association of Counties: Grundy County, IL
- Contact information for the county elected officials. Also includes census facts and demographic data.
- National Register of Historical Places: Grundy County, Illinois
- Directory of places with historical significance. Brief information about the historic function, significance, architectural style, and builder.
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