- Dallas is a city in the state of Texas, United States. It is the ninth-largest city in the country and the third-largest in Texas, behind Houston and San Antonio. Dallas is known for its vibrant arts and culture scene, including the Dallas Museum of Art, the Dallas Symphony Orchestra, and the Dallas Theater Center. The city is also home to several professional sports teams, including the Dallas Cowboys (NFL), Dallas Mavericks (NBA), and Dallas Stars (NHL). Dallas has a diverse population and is a major center for business, finance, and technology.