The Amarillo Metropolitan Statistical Area (MSA) is comprised of four counties as defined by the Federal Register. Carson and Armstrong counties were added to the MSA in 2003 due to 25% or more of the population that commute to Amarillo to work.
Amarillo, Texas is the county seat for Potter County. The county is served by a county judge and four commissioners.
Canyon, Texas, located 19 miles south of Amarillo, is the county seat for Randall County. The county is served by a county judge and four commissioners.