Kentucky Route 9 is a 116.285-mile-long (187.143 km) state highway maintained by the Kentucky Transportation Cabinet (KYTC) in the U.S. state of Kentucky. The highway extends from Grayson to Newport, roughly paralleling the Ohio River between Vanceburg and Newport.

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. Within the city limits, the population was 4,217 at the 2010 census. 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 M.S.A's western boundary.