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1920 Prairie Farmer's Reliable Directory of Farmers and Breeders Clinton County Illinois

FamilySearch Wiki - Clinton County, Illinois

Free online Clinton County, Illinois genealogical research guide.

Genealogy Inc. - Clinton County, Illinois Facts, Genealogy, Records & Links

Linkpendium - Clinton County, Illinois

NACo (National Association of Counties) - County Explorer

Official County Web Site

USGenWeb

USGenWeb Archives