Oklahoma City is the capital and the largest city in the state of Oklahoma. The county seat of Oklahoma County, the city ranks 31st among United States cities in population. The city's population, from the 2010 census, was 579,999, with an estimated metro-area population of 1,252,987. In 2010, the Oklahoma City-Shawnee Combined Statistical Area had a population of 1,322,249 residents. Oklahoma City's city limits extend into Canadian, Cleveland, and Pottawatomie counties, though much of those areas are rural or suburban. The city ranks as the eighth-largest city in the United States by land area (including consolidated city-counties; it is the largest city in the United States by land area whose government is not consolidated with that of a county).Oklahoma City features one of the top livestock markets in the world. Oil, natural gas, and petroleum products are major components of the economy (the city is situated in the middle of an active oil field and oil derricks dot the capitol grounds). The federal government employs many at the Tinker Air Force Base and the United States Department of Transportation's Mike Monroney Aeronautical Center. (These two sites house several offices of the Federal Aviation Administration and the Transportation Department's Enterprise Service Center, respectively.)

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