United Soccer League (USL) | 33,861 followers on LinkedIn. The largest and fastest-growing professional soccer organization in North America. | The United Soccer League (USL) is the largest and fastest-growing professional soccer organization in North America, possessing more than a decade of experience in bringing the world’s game to communities across the United States and Canada. Overseeing the USL Championship (USSF Division II), USL League One (USSF Division III), and USL League Two (Pre-Professional), the organization is built on a proven and recognized model in international football and counts more than 125 clubs in its membership. Based in Tampa, Fla., the USL has grown during the past decade into a model organization with strong corporate partnerships and stable organizational leadership.