The football team won the North II Group IV state sectional championships in 1978, 1979, 1982, 1984–1987 and 1991–1993, and won the North II Group V title in 2019. In the 1979 North II Group IV final, the team won the championship with a 35-24 victory against a Livingston High School team led by quarterback Stan Yagiello at Giants Stadium in front of 15,000 fans The 1991 team came back from a 14-0 at the half to defeat Randolph High School by a score of 24-14 in the North II Group IV championship game, to end Randolph's 59-game unbeaten streak, which was the longest at the time in state history. The 1992 team, ranked fifth in the nation by "USA Today", finished the season with an 11-0 record and extended their winning streak to 22 games after taking the North Group IV state sectional title with a 21-7 victory against Randolph High School in the championship game played in front of 7,000 fans. In 1993, the team beat Randolph 19-6 to win the North II Group IV sectional championship and finish the season 10-1. In 2019, the team won the North II Group V sectional title, the program's first in more than a quarter century, with a 42–28 win against Clifton High School in the championship game. The school's rivalry with Linden High School, with games played on Thanksgiving Day (or the day before Thanksgiving) for more than 75 years, was listed at 13th on NJ.com's 2017 list "Ranking the 31 fiercest rivalries in N.J. HS football". Union leads the rivalry with a 37–32–5 overall record as of 2017.