The Vernon Township High School Vikings participate in the Northwest Jersey Athletic Conference, which includes public and private high schools in Hunterdon, Sussex and Warren counties and was established following a reorganization of sports leagues in Northern New Jersey by the New Jersey State Interscholastic Athletic Association (NJSIAA). The school had participated in the Sussex County Interscholastic League until the SCIL was dissolved in 2009 as part of the NJSIAA realignment.
The Vernon Township High School Vikings are members of the Northwest Jersey Athletic Conference, which comprises public and private high schools from Hunterdon, Sussex, and Warren counties. This conference was formed after a restructuring of sports leagues in Northern New Jersey by the New Jersey State Interscholastic Athletic Association (NJSIAA). Before joining this league, the school participated in the Sussex County Interscholastic League until its dissolution in 2009 as part of the NJSIAA realignment.