Among its Class of 2007, 79 percent of Emmaus High School graduates entered colleges, universities, or other post-graduate education.

The following year, in 1891, the high school grades were moved to the Central Building on Emmaus's Ridge Street.

By 1934, it was considered a state-of-the-art high school with 16 classrooms, a library, an auditorium, a gymnasium, a woodshop, and a home economics room.

Located on Jubilee Street, the station was constructed in the late 19th century, decommissioned, and destroyed by fire on March 1, 1993.

By the early 1960s, the number of sports teams at Emmaus High School expanded to include baseball, football, and wrestling for boys, cross country, field hockey and softball for girls, and basketball, golf, rifle, swimming, and track and field for both boys and girls.

By 1998, the school's population had grown significantly due to an influx of residents predominantly from New Jersey, New York City, and Philadelphia, and Emmaus High School expanded again, taking over the junior high building, adding additional space and using the whole complex to house grades nine through twelve.

In October 2015, Emmaus High School was placed on lockdown amid rumors of potential gun violence.

[10] The main office, auxiliary gym, wrestling room, 40 classrooms, and adjacent areas were impacted by stormwater.

The suspect, a 14-year-old female Emmaus High School student, was arrested the following day, on December 18, and charged with making terrorist threats.

Since 1955, Emmaus has won EPC championships at least once in every one of the conference's sports, and several of its graduates have gone on to professional and Olympic-level athletics, including the NFL and NBA.

Aaron Gray, an alumnus of the Emmaus High School basketball program, went on to a seven-year NBA career from 2007 through 2014, playing for the Chicago Bulls, New Orleans Hornets, Sacramento Kings, and Toronto Raptors and subsequently for three seasons as an NBA coach with the Detroit Pistons from 2015 through 2018.

Emmaus High School boys soccer has played for the EPC championship in each of the past eleven consecutive seasons (2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021), winning five district titles during this period.

[25] In March 2023, Emmaus High School won its 16th consecutive PIAA District 11 boys swimming and diving championship.

[33] Emmaus High School girls field hockey team has consistently ranked among the best in the nation for decades.

Emmaus has won the Pennsylvania state championship in girls field hockey thirteen times in the program's history.

As of 2022, Emmaus High School has won the PIAA District 11 girls field hockey championship in 34 consecutive seasons.

In 2008, Emmaus High School's boys volleyball team won the EPC championship and advanced to the Pennsylvania state tournament.

In 2012, Emmaus High School's wrestling team took first place in the United States Military Duels held in South Carolina.

[40] In December 2007, Emmaus' men's a cappella group, known as Fermata Nowhere, landed a brief stint on NBC's Clash of the Choirs, performing "Jingle Bells".

In April 2015, Emmaus High School's chorale group under the direction of Rita Cortez performed at St. Peter's Basilica in Vatican City, Italy and has visited other locations in Europe since.

The Stinger is known to tackle controversial topics, especially Emmaus High School's problems with student fights, truancy, and widespread recreational drug use.

[43][44][45] In 1993, former Superintendent Alrita Morgan censored an editorial, which was seen as critical of then East Penn School District board member Mary Lou Stefanko.

[46] The publication has not faced any notable instances of censorship since then, and works to make sure all content remains student-produced and edited.