Pampa is a city in Gray County, Texas, United States. The population was 17,887 at the 2000 census. It is the county seat of Gray County. Pampa is the principal city of the Pampa Micropolitan Statistical Area, which includes all of Gray and Roberts counties. Each July, Pampa hosts the Top 'O Texas Rodeo, which brings competitors from a multi-state area to Gray County. The White Deer Land Company Museum, which contains ranching exhibits, is located in downtown Pampa.