| Capitolimpact: Profile for Union County: Information on the political infrastructure of the county. |
| County Map: Map of Union County. |
| The Political Graveyard: Union County, Ohio: Site contains information on the political history of Union County, cemeteries and memorial sites in the county. |
| Union County Chamber of Commerce: Information on chamber events, community services, county statistics, and government offices. |
| Union County Connections: Includes county profile and services, educational and government websites, parks and recreation, health facilities, and places to visit. |
| Union County Extension Office: Branch office of Ohio State University, it combines the needs of local citizens and communities, with new research and technical information. |
| Union County Health Department: Mission is to promote the wellness of all Union County residents and protect their health and safety by providing high quality public health services. |
| Union County Profile: Provides demographic, business, and agriculture profiles. |
| Union County Recreational Facilities: A list of Ohio Department of Natural Resources state nature preserves in the county. |
| Union County, Ohio: Official site provides information about the government, public safety, zoning, building and services in the county. |
| Union County, Ohio - U.S. Census Bureau: Provides population, demographic, and housing information. |
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