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ePodunk - Jefferson County
Provides ancestral demographics for the county & categorized links to other genealogy sites.
FamilySearch Wiki - Jefferson County, Illinois
Free online Jefferson County, Illinois genealogical research guide.
Genealogy Inc. - Jefferson County, Illinois Facts, Genealogy, Records & Links
Illinois Trails History & Genealogy
NACO (National Association of Counties) - About Counties
Cities in the County
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