Wikipedia: Union County, Iowa
- Encyclopedia article covers geography, demographics and links to localities. Includes maps.
- http://en.wikipedia.org/wiki/Union_County,_Iowa

City-Data.com: Union County, Iowa
- Profiles population demographics, jobs, housing, agriculture and crime statistics. Contains a list of recreational areas, churches, cemeteries, post offices, charts, graphs and maps.
- http://www.city-data.com/county/Union_County-IA.html

Union County, Iowa - US Census Bureau
- Provides population, demographic, and housing information.
- http://quickfacts.census.gov/qfd/states/19/19175.html

Union County Development Association
- Offers assistance in the areas of industrial retention and recruitment, housing programs and community development. Includes newsletters and reports. Located in Creston.
- http://www.ucda.us/

Union County Iowa Courthouse
- Features its history, department profiles, board of supervisors meeting minutes, FAQs, document downloads and community calendar.
- http://www.unioncountyiowa.org/

Iowa State University Extension - Union County
- Offers agricultural, business, family and 4-H programs and resources. Includes staff directory, news, events, hours and directions. Located in Creston.
- http://www.extension.iastate.edu/union/

Union County, Iowa
- Provides information about lodging, festivals and events, historical and recreational sites, hunting and fishing, and links to communities.
- http://www.unioncountyiowatourism.com/