- Census Bureau QuickFacts: Hardin County
- Includes data about the county businesses, population, geography, housing, and households.
- Hardin County
- Official county information for its communities, clubs and local services.
- Hardin County Genealogy Trails
- Provides genealogical and historical data including obituaries, cemeteries, photos, family trees, war records, newspapers, mortality schedules and history.
- Hardin County Genealogy: ILGenWeb
- Resource for county genealogy research that includes county history, biographies, queries, maps and links to other resources.
- National Association of Counties: Hardin County, IL
- Includes list of elected officials, places, and facts provided by the Census Bureau.
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