Vega is a city in Oldham County, Texas, United States. It is the county seat of Oldham County . The population was 936 at the 2000 census. A July 1, 2009, U.S. Census Bureau estimate placed the population at 896. In 2005, Vega was the setting for the CMT reality show, Popularity Contest. It is located west of Amarillo on historic U.S. Route 66.