<Tr> <Th> U.S. Routes </Th> <Td> </Td> </Tr> <Tr> <Th> Website </Th> <Td> dallascityhall.com </Td> </Tr> <P> Dallas (/ ˈdæləs /) is a city in the U.S. state of Texas . It is the most populous city in the Dallas--Fort Worth metroplex, which is the fourth most populous metropolitan area in the United States . The city's population ranks ninth in the U.S. and third in Texas after Houston and San Antonio . 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, the city had a population of 1,197,816 . The United States Census Bureau's estimate for the city's population increased to 1,317,929 as of July 1, 2016 . </P> <P> The city is the largest economic center of the 12 - county Dallas--Fort Worth metroplex metropolitan area (commonly referred to as DFW), which had a population of 7,246,231 as of July 1, 2016, representing growth in excess of 807,000 people since the 2010 census . In 2016 DFW ascended to the number one spot in the nation in year - over-year population growth . In 2014, the metropolitan economy surpassed Washington, D.C. to become the fifth largest in the U.S., with a 2014 real GDP over $504 billion . As such, the metropolitan area's economy is the 10th largest in the world . In 2013, the metropolitan area led the nation with the largest year - over-year increase in employment and advanced to become the fourth - largest employment center in the nation (behind New York City, Los Angeles and Chicago) with more than three million non-farm jobs . As of January 2017, the metropolitan job count has increased to 3,558,200 jobs . The city's economy is primarily based on banking, commerce, telecommunications, technology, energy, healthcare and medical research, and transportation and logistics . The city is home to the third - largest concentration of Fortune 500 companies in the nation (behind New York City and Houston). </P>

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