The school's campus is on a 135-acre (0.55 km2) parcel of land in the center of town off of Mammoth Road (New Hampshire Route 128).

In 1982, a new junior high school was built nearby, and the original building adopted its current ninth through twelfth grade system.

[5] For the 2020–21 academic year, Londonderry High School enrolled 1,432 students, according to the National Center for Education Statistics.

The school offers many different accelerated programs, such as Project Running Start, which helps students transition into tertiary education or careers.

[9][10] Londonderry High School's varsity baseball team won its seventh state championship in 2023.

They are best known for their 1990-1999 campaign "Team of the 90's" with top runner John Mortimer who was ranked No.1 nationally in high school cross country.

Londonderry High School's boys track and field team has totaled over 25 state Class L titles, indoor & outdoor, since the program was initiated in the 1980s.

Londonderry High School's boys varsity soccer team won Class L championships in 1990 (undefeated), 1996 and 1999.

In 2009 they were honored with an invitation to march in Ireland's St. Patrick's Day parade but graciously declined it and performed in New York for a 14th time.

The band has traveled to Washington, D.C. and marched in the 2009 and 2013[13] inauguration parades for President Barack Obama on January 20 and 21, respectively.

Notable performances: Londonderry High School holds an annual assembly, during which over a hundred students donate at least eight inches of their hair to Pantene Beautiful Lengths to help make wigs for cancer patients.

[14] Even after Pantene ended their campaign in 2018, Londonderry High School continues to hold an annual hair drive.

During the 2004 season, Team 1058 changed their name to the "PVC Pirates" due to their robot design resembling a sailing ship when fully deployed.

[citation needed] In 2017, Team 1058 seeded first and captained the winning #1 alliance in the Archimedes division at the World Championship in St. Louis, MO, giving them the prestigious opportunity to compete alongside past world champions, and hall of fame teams on the Einstein Field.

The team, then led by Coach Mike Wenger, also finished second in the Tri-State Math League for the year's competition.