IAGenWeb State Census Project - Jefferson County the goal of this project is to IAGenWeb and publish online, all State of Iowa (Non-Federal) censuses for free public genealogical research
Iowa Graves Survey - Jefferson County 1930s graves registration survey
Iowa Gravestone Photo Project - Jefferson County search gravestone photos indexed by county submitted by volunteers
Jefferson Co. Genealogy Forum read and post messages about your ancestors for this county
Jefferson County, IA Genweb Project a collection of online resources for genealogy researchers
Jefferson County Message Board read and post messages with other genealogy researchers of this county
The Tombstone Transcription Project - cemeteries for Jefferson Co. IA
US GenWeb Archives for Jefferson County cemeteries, newspapers, wills, military rosters etc recorded online
WWII Honor List of Dead and Missing

Additional Resources

Iowa Public Records Search find living & deceased family members/relatives including address, phone number, age..
Iowa Birth Records
Iowa Marriage Records
Iowa Divorce Records
Iowa Death Records