Unionville, Frederick County, Maryland
Unionville is an unincorporated community in Frederick County, Maryland, United States. It is located approximately halfway between Frederick and Westminster, just east of Libertytown off Maryland Route 26 (Liberty Road). The Pearre-Metcalfe House was listed on the National Register of Historic Places in 1979.
Unionville holds the world record for most rainfall recorded in one minute. On July 4, 1956 1.23 inches of rain fell in one minute. 
- "Geographic Names Information System". Unionville (Populated Place). U.S. Geological Survey. 2009-01-29.
- National Park Service (2008-04-15). "National Register Information System". National Register of Historic Places. National Park Service.
- "America's Heaviest Rainfall Records". The Weather Channel. Retrieved 2017-08-27.
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