Dallas /?dæl?s/ is the ninth-largest city in the United States and the third-largest city in the state of Texas. The city's prominence arose from its historical importance as a center for the oil and cotton industries, and its position along numerous railroad lines. The bulk of the city is in Dallas County, of which it is the county seat. However, sections of the city are located in Collin, Denton, Kaufman, and Rockwall counties. According to the 2010 United States Census Bureau, the city had a population of 1,197,816. The U.S. Census Bureau's estimate for the city's population increased to 1,241,162 as of 2012.
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