- Jefferson County
- Includes historical information on the county, public meeting calendar, and details of local services, offices, and officials.
- Jefferson County Genealogy
- Offers biographies, listing of cemeteries, and family information.
- Jefferson County Nebraska Genealogy Trails
- Offers genealogy and history research facts, that includes cemeteries, biographies, historic places, marriages, military, obituaries, newspaper articles and other historical resources.
- National Association of Counties: Jefferson County, NE
- General information about the county, list of elected officials, demographic and census data.
- National Register of Historical Places: Jefferson County, Nebraska
- List of districts, sites, buildings, structures, and objects that are significant in American history, architecture, archaeology, engineering, and culture. Information about the properties and their significance and function.
- The Oregon Trail, Jefferson County
- Gives a history for the heart of the Oregon Trail which ran right through this county.
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