After decades of suburban-led metropolitan growth, some have heralded a resurgence of urban living in the U.S., particularly among young adults. So are Americans really turning their backs on suburbs in favor of more urban lifestyles? If so, what is the scope and scale of this urban resurgence? To answer these questions, we develop a typology of seven neighborhood types to analyze the residential location patterns of young and older U.S. adults from 2000 to 2011-15. Census and national travel survey data reveal that, rather than abandoning suburbs en masse, suburban population growth continues to far outpace that in urban neighborhoods. Although young adults are more likely than older adults to live in urban neighborhoods, recent urban population growth is neither associated with suburban decline, nor being led by young adults. So while planners can celebrate the revival of many urban neighborhoods in the 2000s, the era of suburban expansion appears far from over, at least in the U.S. Significant recent population growth in the newest, least dense suburban neighborhoods suggests that greenfield development remains the primary means to increase American housing supply. Shifting this metropolitan growth from the suburban fringe would likely require substantially expanding housing supply in already built-up areas, and bringing urban amenities and sustainability improvements to established inner-ring suburbs.