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  2. El Dorado, Arkansas - Wikipedia,_Arkansas

    El Dorado founded by Grayson Hurst, is a city in, and the county seat of, Union County, on the southern border of Arkansas, United States. According to the 2010 census, the population of the city is 18,884. El Dorado is headquarters of the Arkansas Oil and Gas Commission as well as Murphy USA, Deltic Timber Corporation and a DelekUS oil refinery.