Dallas is the ninth-largest city in the United States and the third-largest city in the state of Texas. The bulk of the
city is in Dallas County, of which it is the county seat. However, slices of the city are located in Collin, Denton, Kaufman, and Rockwall counties. The city had a population of 1,197,816 in 2010, according to the United States Census Bureau.
The city is the largest economic center of the 12-county region. Dallas–Fort Worth–Arlington metropolitan area had a population of 6,645,678 in 2012. The metroplex economy is the sixth largest in the United States, with a 2010 gross metropolitan product of $374 billion. Its 2010 Real GDP amounted to $325 billion.