Dallas is in the United States.
Dallas ( [ ˈdæləs ] ) is a major city in the U.S. state of Texas . Dallas County is a county in the U.S. state of Texas . United States . The capital is Washington , D.C. , and the largest city is New York City ; nine other major metropolitan areas -- each with at least 4.5 million inhabitants and the largest having more than 13 million people -- are Los Angeles , Chicago , Dallas , Houston , Philadelphia , Miami , Atlanta , Boston , and San Francisco .