Grayson is a home rule-class city in and the county seat of Carter County, Kentucky, United States, on U.S. Route 60 and Interstate 64 in the state's northeastern region. It is approximately 21 miles west of Ashland. As of the 2020 census, Grayson had a population of 3,834. Along with Carter County, the city is closely associated with the nearby Huntington-Ashland, WV-KY-OH Metropolitan Statistical Area and is often erroneously included in the MSA being just 9 miles west of the MSA's western boundary.