and was established following a reorganization of sports leagues in Northern New Jersey by the New Jersey State Interscholastic Athletic Association (NJSIAA). Prior to the 2010 realignment, the school had competed in the Skyline Division of the Northern Hills Conference. With 1,047 students in grades 10–12, the school was classified by the NJSIAA for the 2019–20 school year as Group III for most athletic competition purposes, which included schools with an enrollment of 761 to 1,058 students in that grade range. The football team competes in the Freedom White division of the North Jersey Super Football Conference, which includes 112 schools competing in 20 divisions, making it the nation's biggest football-only high school sports league.Cooper, Darren. "NJ football: Super Football Conference revised schedules for 2020 regular season", The Record, July 23, 2020. Accessed March 22, 2021. "The Super Football Conference has 112 teams that will play across 20 divisions." The school was classified by the NJSIAA as Group IV North for football for 2018–2020. Known primarily for its consistently strong boys' and girls' tennis and fencing teams, Millburn has been a regular contender for state titles in these sports. The school teams are officially called the Millburn Millers. However, most teams simply call themselves Millburn. The boys track team won the Group II spring track state championship in 1957 and the Group III title in 1960. The Millburn baseball program has a history as a strong competitor in their conference and section. In 2007, the Millers finished 18-9 and bowed out in their sections' semifinals. In 2008, the Millers set a school record with 27 wins, finishing 27–5 with conference and winning a North II, Group III state sectional title with a 9–8 win over John F. Kennedy Memorial High School of Iselin after trailing by 8–0 in the game's fourth inning before losing 17–8 to Northern Valley Regional High School at Old Tappan in the Group III semifinal.Connelly, Jim. "Millburn baseball team reaches sectional final", The Item of Millburn and Short Hills, June 1, 2011. Accessed July 22, 2011. "The Millers are appearing in the section final for the second time in four years. Millburn rallied from an 8-0 deficit to edge Iselin Kennedy 9-8 in nine innings in the 2008 NJSIAA North Jersey, Section 2, Group 3 title contest." In 2015, the Millers won both the Group IV state championship, and the New Jersey state title with an