Union County New Mexico (Historic Districts) has 3 places on the National Register of Historic Places including 1 place of National significance and 2 places of Statewide significance. Significant places include Rabbit Ears, Capulin Volcano National Monument Historic District and Clayton Public Schools Historic District, Capulin Volcano National Monument Historic District.
Some of the country's most noteable architects helped create the Union County places including wpa and William C. Kruger. Prominent architectural styles found in Union Country are Mission/Spanish Revival.