- Jefferson County Chapter, OGS - County chapter of the Ohio Genealogical Society. Provides membership details, officer directory, event calendar, and vital records.
www.rootsweb.com/~ohjefogs
- Jefferson County Historical Association and Museum - Provides overview of museum collections, history, hours of operation, and contact details.
www.rootsweb.com/~ohjcha
- Jefferson County OHGenExchange - Genealogical data exchange where visitors and researchers alike can go to find specific persons, and exchange specific data with one another.
www.genexchange.org/county.cfm?State=oh&County=jefferson
- Jefferson County, Ohio, USGenWeb - An internet source devoted entirely to genealogical research.
www.rootsweb.com/~ohjeffer
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