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Dallas ( /dæləs/) is the third-largest city in Texas and the ninth-largest in the United States. The Dallas-Fort Worth Metroplex is the largest metropolitan area in the South and fourth-largest metropolitan area in the United States. Divided between Collin, Dallas, Denton, Kaufman, and Rockwall counties, the city had a 2010 population of approximately 1.2 million, according to the United States Census Bureau.
The city is the largest economic center of the 12-county Dallas–Fort Worth–Arlington metropolitan area that according to the March 2010 U.S. Census Bureau release, had a population of roughly 6.5 million as of July 2009.
Dallas was founded in 1841 and formally incorporated as a city in February 1856. The city's economy is primarily based on banking, commerce, telecommunications, computer technology, energy, and transportation, and the city is home to the third largest concentration of Fortune 500 companies in the nation. Located in North Texas and a major city in the American South, Dallas is a core of the largest inland metropolitan area in the United States that lacks any navigable link to the sea.