Las Vegas is in the United States.
Las Vegas . The city anchors the Las Vegas Valley metropolitan area and is the largest city within the greater Mojave Desert . The Las Vegas Valley is a major metropolitan area located in the southern part of the U.S. state of Nevada . 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 .