• Tulsa
  • Lingtai County

Tulsa (/ˈtʌlsə/) is the second-largest city in the state of Oklahoma and 47th-most populous city in the United States. The population was 413,066 as of the 2020 census. It is the principal municipality of the Tulsa Metropolitan Area, a region with 1,023,988 residents. The city serves as the county seat of Tulsa County, the most densely populated county in Oklahoma, with urban development extending into Osage, Rogers, and Wagoner counties.

Tulsa was settled between 1828 and 1836 by the Lochapoka Band of Creek Native American tribe and most of Tulsa is still part of the territory of the Muscogee (Creek) Nation.[a]

Historically, a robust energy sector fueled Tulsa's economy; however, today the city has diversified and leading sectors include finance, aviation, telecommunications and technology. Two institutions of higher education within the city have sports teams at the NCAA Division I level: Oral Roberts University and the University of Tulsa. As well, the University of Oklahoma has a secondary campus at the Tulsa Schusterman Center, and Oklahoma State University has a secondary campus located in downtown Tulsa. 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.

Lingtai County is an escrow county of Pingliang City, Gansu Province, located in the southeast of Gansu Province, bordering Changwu, Bin County, Linyou, Qianyang and Longxian of Shaanxi Province in the southeast, and Chongxin and Jingchuan County of Gansu Province in the northwest. The geographical coordinates are 107 °00 east longitude 107 °57km east longitude, 34 °54km north latitude, 35 °14km north latitude, 78 km east-west length, 40 km north-south width, and a total area of 2038 square kilometers. As of 2012, Lingtai County has jurisdiction over 5 towns, 8 townships, 1 street, a total of 4 communities, 1429 administrative villages and 1429 village groups, with a total population of 229752, most of whom are Han nationality, accounting for 96.7%. Ethnic minorities are Hui, Tibetan, Manchu, Miao, Mongolian and so on, accounting for 3.3%. In 2012, Lingtai County realized the regional gross domestic product (G
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