There are several secondary schools called Union County High School in the United States:
Union County High School (Florida) located in Lake Butler, Union County, Florida Union County High School (Georgia) located in Blairsville, Georgia Union County High School (Indiana) located in Liberty, Indiana Union County High School (Kentucky) located in Morganfield, Kentucky Union County High School (South Carolina) located in Union, South Carolina Union County High School (Tennessee), formerly Horace Maynard High School, located in Maynardville, Tennessee