Denver is ranked as a Beta world city by the Globalization and World Cities Research Network. The 10-county Denver-Aurora-Lakewood, CO Metropolitan Statistical Area had an estimated 2018 population of 2,932,415 and was the 19th most populous U.S. metropolitan statistical area. The 12-county Denver-Aurora, CO Combined Statistical Area had an estimated 2018 population of 3,572,798 and was the 15th most populous U.S. metropolitan area. Denver was the most populous city of the 18-county Front Range Urban Corridor, an oblong urban region stretching across two states with an estimated 2018 population of 4,976,781. The Denver metropolitan area is the most populous within a radius and the second-most populous city in the Mountain West after Phoenix, Arizona. In 2016, Denver was named the best place to live in the United States by "U.S. News & World Report".