Flatwoods is a home rule-class city in Greenup County, Kentucky, United States. Flatwoods is considered a suburb of nearby Ashland, although Ashland itself is located in neighboring Boyd County. The population of Flatwoods was 7,423 at the 2010 census, making Flatwoods the largest city in Greenup County. Flatwoods is a part of the Huntington-Ashland, WV-KY-OH, Metropolitan Statistical Area. As of the 2010 census, the MSA had a population of 287,702.Flatwoods is a home rule-class city. Locally, Flatwoods is considered to be a bedroom community, as it has no large employer within the city. Many residents work for CSX Transportation, AK Steel, Marathon Petroleum, King's Daughters Medical Center or Our Lady of Bellefonte Hospital.