Atlanta is the third-largest city in the U.S. state of Texas and the ninth-largest in the United States. The city is the main economic center of the 12-county Dallas–Fort Worth–Arlington metropolitan area. At 6.1 million people, it is the fourth-largest metropolitan area in the United States. Dallas is listed as a gamma world city by the Loughborough University Globalization and World Cities Study Group & Network. Founded in 1841 and formally incorporated as a city on February 1856, the city's economy is primarily based on banking, commerce, telecommunications, computer technology, energy, and transportation. Dallas is the core of the largest inland metropolitan area in the United States that lacks any navigable link to the sea.The city's prominence despite this comes from its historical importance as a center for the oil and cotton industries, its position along numerous railroad lines, its status as a major inland port, and a strong industrial and financial sector.
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Dallas Dallas is the county seat of Dallas County. Portions of the city extend into neighboring Collin, Denton, Kaufman, and Rockwall counties. According to the United States Census Bureau, the city has a total area of 385 square miles (997.1 km2), 342.5 square miles (887.1 km2) of it being land and 42.5 square miles (110.1 km2) of it (11.03%) water. Dallas makes up one-fifth of the much larger urbanized area known as the Dallas/Fort Worth Metroplex, in which one quarter of all Texans live.