Boyd County is a county in the US state of Kentucky. At the 2000 census the county had a population of 49,752 inhabitants. It is part of the Huntington-Ashland metropolitan area. The county seat is Catlettsburg. The county was formed in 1860 from portions of Carter, Greenup and Lawrence counties. It was the 107th county in Kentucky to be founded. It was named in honor of Linn Boyd, a Kentucky congressman who served as President of the House of Representatives of the United States between 1851 and 1855.