[7][8] The current school facility opened in September 1964, replacing a building that was operating at more than double its capacity of 300 students.

[10][11] In 1981, the Washington Township district (since renamed as the Robbinsville Public School District) filed a petition with the New Jersey State Board of Education seeking to terminate their sending agreement, noting that the departure of students from Washington Township would not adversely impact the racial balance at Allentown High School.

[20] The Allentown High School Redbirds[2] compete in the Colonial Valley Conference, which is comprised of public and private high schools located in Mercer, Middlesex and Monmouth counties, operating under the supervision of the New Jersey State Interscholastic Athletic Association (NJSIAA).

[27] Against a program that had won eight previous state titles, the 1997 team stayed even with West Essex at 2-2 after regulation and three overtime periods to be declared as co-champion in Group II and finish the season with a 14-game unbeaten streak and a 22-1-1 record.

[28] The 2003 field hockey won the Central, Group II sectional championship, edging Shore Regional High School 3–2 in the tournament final.

[30] The 2003 girls' tennis team won the Central, Group II title with a 3–2 win over Shore Regional High School.

[31] In 2006, the girls' softball won the Central, Group II sectional championship over John F. Kennedy Memorial High School, by a 3–0 final score.

[32] The team moved on to finish the season with a record of 23-4 after winning the NJSIAA Group II state championship, topping Pascack Valley High School in the finals by a score of 11–1 in five innings, under the mercy rule.

[38] The boys soccer team won the Group III state title in 2013 as co-champion with Northern Highlands Regional High School.

[44] In 2017, the girls' soccer team went 22–1, winning the Central Jersey Group III state sectional championship, the program's first, over Toms River High School East by a score of 2–1.

[45] They then went on to win the Group III state title over Middletown High School South in the playoff finals by a score of 2–1.

Jasmine Aizley, the first and only female wrestler on the team, qualified in the inaugural 2018-2019 and also the 2019–2020 seasons, her junior and senior year.

After paying a fee, eleventh and twelfth grade students are given the privilege to drive their cars to school and park in assigned spots.

The band has gone on to winning many other awards and appearances, such as the St. Patrick's Day Parade on New York City's Fifth Avenue.