Grainger, Jefferson and Sevier counties were added in 1980, and it became the Knoxville Metropolitan Statistical Area.[4] Campbell, Grainger, Morgan and Roane Counties were added to the MSA, making it a nine-county metropolitan region.As of 2010, the Knoxville CSA ranked as 51st largest in the United States with a 2010 census population of 1,077,073.[9] As of 2004, the federal government's Bureau of Economic Analysis (BEA) identified the Knoxville Economic Area as consisting of the Knoxville–Sevierville–LaFollette CSA (as it was then defined) plus Bell County, Kentucky, and Claiborne, Hancock, Monroe, Morgan and Scott counties in Tennessee.[10][11] BEA defines economic areas as metropolitan or micropolitan statistical areas that form regional centers of economic activity, plus the surrounding counties that are determined to be economically related to these centers of activity, based on a combination of census commuting data and newspaper circulation data supplied by the Audit Bureau of Circulations.