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Jefferson County Genealogical Society
http://www.rootsweb.com/~mojcgs/index.html
The purpose of this web site is to familiarize Jefferson County researchers as to what is available at and from our society.
Jefferson County Historical Society
http://www.rootsweb.com/~mojeffer/jchs/index.html
Aid in the preservation and research of the history of Jefferson County, Missouri. Publications are available for helping people research their ancestors who were in Jefferson County, Missouri.
Missouri Census
http://www.oseda.missouri.edu/mscdc/census/us/basictables/us.text/county/MO/MOJEFFER
Jefferson County, Missouri census information from 1990.
National Register of Historical Places
http://www.nationalregisterofhistoricplaces.com/MO/Jefferson/state.html
Jefferson County, Missouri.