[10] On August 26, 1977, a 14-year-old school football player was one of six people killed in a mass shooting event nearby.

[22] The football team competes in the American 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.

[25] The school competes in interscholastic football, golf, soccer, cheerleading, volleyball, marching band, cross country, basketball, wrestling, fencing, baseball, softball, field hockey, lacrosse and track.

[27] The 1981 football team finished the season with an 8-2-1 record after winning the North II Group II state sectional title with a 7-6 win against Jonathan Dayton High School in the championship game after a failed extra point that would have tied the game.

[28][29][30][31] The boys' soccer team won the Group III state championship in 2001 (defeating Hopewell Valley Central High School in the tournament final) and the Group II title in 2014 (vs. Cinnaminson High School).

[32] The 2001 team finished the season with a 18-6-2 record after winning the Group III title with a 2-0 victory in the championship game played at The College of New Jersey.

They then went on to play Ramsey High School where they were tied 1-1 after regulation and two overtimes; In penalty kicks, Hackettstown won by a score of 4-1.

In the Group II tournament finals, Hackettstown beat Cinnaminson High School by a score of 3-1 at Kean University, earning the team's first championship since winning the Group III state championship in 2001 and capping a season in which the team broke a total of 8 school records including most goals scored in a season (27), most shutouts posted (8) and fewest losses (1).