Las Vegas is in Colorado.
Las Vegas ( [ lɑːs_ˈveɪɡəs ] , Spanish for `` The Meadows '' ) , officially the City of Las Vegas and often known simply as Vegas , is the 28th-most populated city in the United States , the most populated city in the state of Nevada , and the county seat of Clark County . Las Vegas Valley . The Las Vegas Valley remains one of the fastest growing metropolitan areas in the United States , and in its relatively short history has established a diverse presence in international business , commerce , urban development and entertainment , as well as one of the most iconic and most visited tourist destinations in the world . Mojave Desert . It is located in the southwestern United States , primarily within southeastern California and southern Nevada , and it occupies a total of 47877 mi2 .