The school serves students in ninth through twelfth grades who live in the eastern half of Parsippany-Troy Hills.

[16] Interscholastic sports and activities offered at Parsippany High include football, soccer, cross-country running, marching band, field hockey, volleyball and cheerleading in the fall, swimming, basketball, ice hockey, wrestling, track and cheerleading in the winter, and baseball, softball, track, tennis and golf in the spring.

[20] The boys cross country running team won the Group III state championship in 1982.

[25] The boys' basketball team won the Group III state championship in 1999, after coming back from five point deficit in the final minute of the game to defeat Lawrence High School by a score of 57-55 in the final game of the tournament`[26][27] and advanced to the Tournament of Champions as the fifth seed, falling in the quarterfinals to fourth-seed Holmdel High School by a score of 77-55 to finish the season with a record of 20-7.

[32] The girls' outdoor track and field team won the Group II state championship in 2006.

[33] The school's marching band won the USBands Group IV A National & NJ State Championships in 2015 with their program Cloud 9.