The last several decades have witnessed a large increase in the number of girls who participate in sports in the United States. Today an estimated 8 million third- through 12th-grade girls and 12 million boys participate in organized and team sports. While much progress has been made toward achieving gender equity in youth sports, too many girls are being left behind--especially in urban communities. This article reports on some key findings from "Go Out and Play: Youth Sports in America" (Sabo & Veliz, 2008), a comprehensive study based on two nationwide surveys of youth sport participation in the United States. (Contains 3 figures.)