40th out of 500 best high schools in the country; it was ranked 12th among all high schools in New Jersey and first among the state's non-magnet schools. Music and theater Marching band Chatham High has a marching band led by Brian Conti. This past season the 58 member band fell under the Group 2 open classification. The band was ranked continuously in the top five bands in Group 2 Open and held an overall #1 ranking for several weeks in 2008. As of 2012, the band is now in Group 3 Open. Theater Chatham High School has an active theater program that performs two productions a school year, a play in the fall and then a musical in the Spring. In past years the Theater Department has put on The Laramie Project, The Crucible, The Adding Machine, You Can't Take It with You, A Midsummer Night's Dream, Scapino, Our Town, Metamorphoses & Look Homeward, Angel. As for musicals the High School has presented The Wizard of Oz, The Pajama Game, High School Musical, How to Succeed in Business Without Really Trying, Grease, Guys and Dolls, The Drowsy Chaperone, Legally Blonde, Anything Goes, Once Upon a Mattress, Shrek and The Addams Family Fiddler on the Roof and The Hunchback of Notre Dame. Athletics The Chatham High School Cougars compete in the Northwest Jersey Athletic Conference, which is comprised of public and private high schools in Morris, 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). Prior to the NJSIAA's 2010 realignment, the school had competed as part of the Iron Hills Conference, comprised of public and private high schools in Essex County and Union County. With 979 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 Patriot 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. The school was classified by the NJSIAA as Group IV North for football for 2018–2020. The school participates in a joint wrestling team with Summit High School as the host school / lead