Amarillo is a city in the U.S. state of Texas and the county seat of Potter County. A portion of the city extends into Randall County. As of the 2000 U.S. Census, the city had a total population of 173,627 (though a July 1, 2005 estimate placed the city's population at 183,021). The Amarillo metropolitan area, however, has an estimated population of 236,113 in four counties.
The city once self-proclaimed as the "Helium Capital of the World" for having one of the country's most productive helium fields. The city is also known as "The Yellow Rose of Texas" and most recently "Rotor City, USA" for its V-22 Osprey hybrid aircraft assembly plant.