Tulsa is the second-largest city in the U.S. state of Oklahoma and 46th-largest city in the United States. With a population of 393,987 (2012 US Census estimate), it is the principal municipality of the Tulsa Metropolitan Area, a region with 951,880 residents in the MSA and 1,122,259 in the CSA. The city serves as the county seat of Tulsa County, the most densely populated county in Oklahoma, and extends into Osage, Rogers, and Wagoner counties.
Tulsa was first settled between 1828 and 1836 by the Lochapoka Band of Creek Native American tribe. For most of the 20th century, the city held the nickname "Oil Capital of the World" and played a major role as one of the most important hubs for the American oil industry. Tulsa, along with several other cities, claims to be the birthplace of U.S. Route 66 and is also known for its Western Swing music.