Oklahoma City (), often shortened to OKC, is the capital and largest city of the U. S. state of Oklahoma. The county seat of Oklahoma County, the city ranks 27th among United States cities in population.
Oklahoma City is the largest city in the state, as well as its political, cultural, and economic engine. The city is the nation's third largest city in land area (608 sq miles), just behind Jacksonville FL (759 sq miles) and way behind Anchorage AK (1698 sq miles). The city is the 29th largest city in population in the nation (506,132 in the 2000 census), and the largest city in the 5 "plains states" (Oklahoma, Kansas, Nebraska, and North and South Dakota). After decades of suburban sprawl and an ill-fated downtown "urban renewal", a 'sudden' burst of investment in the 1990s has given the city additional big city attractions as well as a pleasant quality of life that often is the envy if not surprise of visitors from other cities, making Oklahoma City more of a tourist destination in and of itself. Oklahoma's state capitol building is the only capitol in the world with an oil well under it. Although its legal description is Capitol Site #1, it is referred to as Petunia #1 because it was originally drilled in the middle of a flower bed.