 The West Milford High School Highlanders compete in the Big North Conference, following a reorganization of sports leagues in Northern New Jersey by the New Jersey State Interscholastic Athletic Association (NJSIAA).With 866 students in grades 10-12, the school was classified by the NJSIAA for the 2015–16 school year as North I, Group III for most athletic competition purposes, which included schools with an enrollment of 786 to 1,074 students in that grade range.In the 2009-10 school year, the school competed in the North Jersey Tri-County Conference, which was established on an interim basis to facilitate the realignment.