Bloomfield is a home rule–class city in Nelson County, Kentucky, in the United States. The population was 838 during the 2010 U.S. census. Former names of the city included Middlesburg and Gandertown.

Nelson County is a county located in the U.S. state of Kentucky. As of the 2020 census, the population was 48,065. Its county seat is Bardstown. Nelson County comprises the Bardstown, KY Micropolitan Statistical Area, which is also included in the Louisville/Jefferson County-Elizabethtown-Madison, KY-IN Combined Statistical Area.