Northwest Arkansas (NWA) is a metropolitan area and region in Arkansas within the Ozarks. It includes four of the ten largest cities in the state: Fayetteville, Springdale, Rogers, and Bentonville, the surrounding towns of Benton and Washington counties, and adjacent rural Madison County, Arkansas. The United States Census Bureau-defined Fayetteville–Springdale–Rogers Metropolitan Statistical Area includes 3,213.01 square miles (8,321.7 km²) and 622,177 residents, ranking NWA as the 98th most-populous metropolitan statistical area in the U.S. and the 13th fastest growing in the United States.