[1] The district's original high school, constructed at a cost of $45,380 (equivalent to $1.5 million in 2023) was completed in January 1909.

[5] The current facility was completed and formally dedicated in October 1958,[6] at which time the previous building becoming Franklin Middle School.

[14] The football team competes in Division 2B of the Big Central Football Conference, which includes 60 public and private high schools in Hunterdon, Middlesex, Somerset, Union and Warren counties, which are broken down into 10 divisions by size and location.

The boys' track team won the indoor relay championship in Group I/II in 1972 and 1973 (as co-champion with Saddle Brook High School), and the Group I title in 1992, 1997, 1999, 2003 and 2008; The seven titles are tied for third-most among public high schools in the state.

[22] The 1985 football team won the Central Jersey Group I state sectional title with a 7-0 victory against Keyport High School in the championship game.

[28] In 2007, the girls' soccer team won the Central Jersey, Group I state sectional championship with a 1–0 win over Robbinsville High School in the tournament final.

[31][32][33] The Pride of Metuchen High School Marching Band consists of over 80 wind, percussion, and color guard members.

At the 2013 New Jersey state championships at Rutgers University, the marching band won 3rd place in Group 4 Open competition.