The school was the 131st-ranked public high school in New Jersey out of 339 schools statewide in New Jersey Monthly magazine's September 2014 cover story on the state's "Top Public High Schools", using a new ranking methodology. The school had been ranked 169th in the state of 328 schools in 2012, after being ranked 161st in 2010 out of 322 schools listed. The magazine ranked the school 99th in 2008 out of 316 schools. The school was ranked 86th in the magazine's September 2006 issue, which surveyed 316 schools across the state. Schooldigger.com ranked the school 132nd out of 381 public high schools statewide in its 2011 rankings which were based on the combined percentage of students classified as proficient or above proficient on the mathematics and language arts literacy components of the High School Proficiency Assessment. In its 2013 report on "America's Best High Schools", The Daily Beast ranked the school 1028th in the nation among participating public high schools and 72nd among schools in New Jersey.
Athletics
The New Milford High School Knights compete in Patriot Division A of the North Jersey Interscholastic Conference, made up of private and public high schools located in Bergen County, Passaic County and Hudson County, following a reorganization of sports leagues in Northern New Jersey by the New Jersey State Interscholastic Athletic Association. With 490 students in grades 10-12, the school was classified by the NJSIAA for the 2015-16 school year as North I, Group I for most athletic competition purposes, which included schools with an enrollment of 187 to 490 students in that grade range. Prior to realignment that took effect in the fall of 2010, New Milford was a member of the Bergen County Scholastic League in the Olympic Division. The Knights have won multiple league championships in bowling, football, basketball, and wrestling, as well as soccer. The school operates as the host school / lead agency for joint boys' / girls' swimming programs with Dumont High School, under an agreement that expires at the end of the 2018-19 school year. The football team was awarded the sectional championship by the New Jersey State Interscholastic Athletic Association in 1972. Since the playoff system was introduced in 1974, the team has won the North I Group I state sectional championships in both 1985 and 1986. The girls' track team won the Group I indoor relays state championship in 1987. In 2004, the baseball team won the program's first Group I state championship, defeating New Providence High School by a score of 2-0 in the tournament final. The team won the North I, Group I sectional championship with a 16–1 win over Hasbrouck Heights High School, and then won the state championship with a 3–0 win over Henry P. Becton Regional High School in the semifinals and a 2-0 win in the finals vs. New Providence High School. Pitcher PJ Saporito was named 1st team all-league, all-county and all-state while compiling a 12–0 record and 0.53 ERA, and was selected as the North Jersey Player of the Year. The team repeated as league and as North I, Group I sectional champions in 2005 with a 6–5 win over Glen Rock High School. The varsity bowling team compiled four straight state sectional titles from 2006-2009.
Television appearances
On June 23, 2007, 55 music students were selected to participate in the second episode of the reality show Schooled, after which they were surprised with a private concert by The All-American Rejects and given backpacks filled with OfficeMax merchandise. The chain also granted New Milford High School a $60,000 gift card. The one-hour show aired on August 5, 2007 on The CW Television Network. The school was featured on the truTV show The Principal's Office, originally aired on August 21, 2008.
Administration
The principal is Lou Manupelli.
Notable alumni
Adam Leitman Bailey, attorney recognized with the New Milford Distinguished Alumni Award in 2008.
Joshua Dela Cruz, actor chosen in 2018 to be the host of Blue's Clue & You, a reboot of the Nickelodeon series Blue's Clues.
Ed Marinaro, former college and NFL football player and actor in the television series Hill Street Blues.
Rob McClure, Theatre World Award-winning and Tony Award-nominated theatrical actor.