The city is in the middle of an active oil field, and oil derricks dot the capitol grounds.

Oil, natural gas, petroleum products, and related industries are its economy's largest sector. Oklahoma City has one of the world's largest livestock markets. The city is also the second-largest by area among state capital cities in the United States, after Juneau, Alaska.

The city is the eighth-largest in the United States by area including consolidated city-counties it is the second-largest, after Houston, not including consolidated cities. Oklahoma City's city limits extend somewhat into Canadian, Cleveland, and Pottawatomie counties, though much of those areas outside the core Oklahoma County area are suburban tracts or protected rural zones ( watershed). The Oklahoma City metropolitan area had a population of 1,396,445, and the Oklahoma City– Shawnee Combined Statistical Area had a population of 1,469,124, making it Oklahoma's largest municipality and metropolitan area by population. The population grew following the 2010 census and reached 681,054 in the 2020 census. The county seat of Oklahoma County, it ranks 20th among United States cities in population, and is the 8th largest city in the Southern United States. Oklahoma City ( / oʊ k l ə ˌ h oʊ m ə -/ ( listen)), officially the City of Oklahoma City, and often shortened to OKC, is the capital and largest city of the U.S.

Oklahoma city airport zip code