As of the 2005-06 school year, the school had an enrollment of 1,208 students and 96.0 classroom teachers (on a FTE basis, for a student-teacher ratio of 12.6.
Its sister school, West Morris Central High School, is located in Washington Township. Students from Washington Township attend West Morris Central. The two schools maintain a healthy athletic rivalry, despite the fact that they have been in different Divisions of the same Conference since the 1994-1995 school year. Mount Olive High School broke from the then three school District in the 1970s.
Mendham was certified to offer the International Baccalaureate (IB) diploma in January 1998. The school is one of only 16 schools in New Jersey to offer the IB program.
The school was the 38th-ranked public high school in New Jersey out of 314 schools statewide, in New Jersey Monthly magazine's September 2008 cover story on the state's Top Public High Schools. The school was ranked 29th in the magazine's September 2006 issue, which included 316 schools across the state.
West Morris Mendham High School offers over 30 Athletic teams ranging in level from Freshman (no cuts) to Varsity. Mendham has a strong tradition of athletic excellence; since the school's opening in the fall of 1970, Mendham varsity teams have brought home more than 100 conference, county, region, and state championships.
Varsity Cross Country The West Morris Mendham Boys Cross Country Team placed 2nd at the Iron Hills Conference Championships in 2007. The varsity roster for the 2007 team included Michael Franklin (15:54.42 5kPR), James Frick(16:47.40 5kPR), Jon Riley (17:04.87 5kPR), Ryan Savercool (17:20.24 5kPR) and Christian Herridge(17:29.85 5kPR).
The West Morris Mendham Girls Cross Country Team roster in 2007 included Laura Vigilante(19:10.00 5kPR) and Janice O'Brien(19:36.00 5kPR). Both girls qualified for the Meet of Champions at Holmdel Park.
Varsity Football: The West Morris Mendham Minutemen participate in the Iron Hills Conference. The Football team under head coach Richard Attonito (1971-1988) secured three Colonial Hills Conference titles ('75, '82, '83) including a State Group I Championship in 1975, capping an undefeated season which included a still standing club record 8 shutouts. Under Head Coach William "Bill" Carpluk (1989-2005), the team posted a 116-49 (.703) overall record, including a club record 17 game winning streak (1992-1993). Carpluk's teams garnered six Iron Hills Conference Hills Division (IHC-Hills) championships ('93-'95, '00, '01, '04) and numerous Group II and III state championship playoffs and finals appearances. Carpluk's era ushered in a new period during which they posted only two losing seasons during his 16 season tenure. The team is currently under the leadership of a veteran coaching staff, led by Head Coach Doug Kirk (11-9) since the 2006 season, a former assistant to both Attonito and Carpluk. The 2007 team finished 7-3 and was one of only three 6-2 Group III teams in the state to be denied a playoff bid under the NJSIAA Power Point system. The booster club is working on efforts to finance a new 'field turf' stadium for the Minutemen.
Other Sports: The Varsity Boys Lacrosse team was crowned sole New Jersey State Champions in 1994, winning the New Jersey Tournament of Champions. In 1998, the Varsity Girls Basketball team finished #1 in the State of New Jersey, also winning the Tournament of Champions. For the past 14 years in a row, the varsity Girls Soccer team has won the Iron Hills Conference Championship. The Girls Lacrosse team was ranked #2 in the state in 2005 and is currently ranked #3. The Girls Tennis team has been for the past four years ranked in the Top 5 in the State.
The girls lacrosse team won the 2007 Group II State Championship with a 17-4 win vs. Hopewell Valley Central High School.
In 2007, the girls soccer team won the North II, Group III state sectional championship with a 2-0 win over Scotch Plains High School in the tournament final.
Each of the four levels in classes differs in the level of rigor, with studies being the least rigorous and Honors/AP/IB being the most rigorous. Students and their parents are free to decide the level of the students classes.