Union County is the name of seventeen counties in the United States:

• Union County, Arkansas
• Union County, Florida
• Union County, Georgia
• Union County, Illinois
• Union County, Indiana
• Union County, Iowa
• Union County, Kentucky
• Union County, Mississippi
• Union County, New Jersey, the most populous Union County in the country
• Union County, New Mexico
• Union County, North Carolina
• Union County, Ohio
• Union County, Oregon
• Union County, Pennsylvania
• Union County, South Carolina
• Union County, South Dakota
• Union County, Tennessee

• Union Parish, Louisiana

This disambiguation page lists articles associated with the title Union County.
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