With a population of 1.331 million inhabitants, Dallas (located in the southern part of the United States) is the third largest city in terms of population in the US state of Texas, after Houston and San Antonio. It is seen as being an important economic center, the metropolitan area (6.5 million people) is the largest in the southern United States. Tourist attractions in Dallas? Sixth Floor Museum, Dallas Arboretum, Perot Museum, Dallas Museum of Art, Dallas World Aquarium, etc.