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Casper is a city in and the county seat of Natrona County, Wyoming, United States. It is the second-most populous city in the state after Cheyenne, with its population at 59,038 as of the 2020 census. Casper is nicknamed "The Oil City" and has a long history of oil boomtown and cowboy culture, dating back to the development of the nearby Salt Creek Oil Field.
Source: Wikipedia