Las Vegas is in Clark County.
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 . The Las Vegas Valley is a major metropolitan area located in the southern part of the U.S. state of Nevada .