Union County Ohio (Vacant / Not In Use) has 2 places on the National Register of Historic Places. Prominent architectural styles found in Union Country are .
Gilcrist House
(added 1976 - #76001537)
Also known as Gilchrist Corners;Gilcrest Farm
3.5 mi. SE of Marysville off SR 33 , https://npgallery.nps.gov/AssetDetail/NRIS/76001537