Union County Historical Society
- Organized to preserve county history and heritage by encouraging historic preservation, research, education and teaching. Organization information, historical articles, and exhibits and hours for Roy Acuff Museum & Library in Maynardville.
- http://www.unioncountytn.com/history/

The Union County Cemeteries Association
- Organized to preserve the county's cemeteries. Information about activities and goals, list of cemetery locations, photo collection, local history, and other resources.
- http://www.usgennet.org/usa/tn/county/union2/

Union County Genealogy
- Provides access to Census data, old public records, and other research resources.
- http://www.rootsweb.com/~tnunion/

New Deal Network Photo Library: Big Ridge Dam
- Historical images of the construction of this dam, built by the Civilian Conservation Corps and the National Park Service in cooperation with TVA.
- http://newdeal.feri.org/library/browse_photos.cfm?ProjCatID=10535&CatID=27&subCatID=1113

Union County TnGenWeb
- History and genealogy information for Union County. Covers Maynardville, Luttrell, Corryton, and Sharps Chapel.
- http://www.tngenweb.org/union/