The Hammonton High School Blue Devils compete in the
Cape-Atlantic League, an athletic conference comprised of public and private high schools in
Atlantic,
Cape May,
Cumberland and
Gloucester counties, that operates under the supervision of the
New Jersey State Interscholastic Athletic Association (NJSIAA). The school, a founding member of the Cape-Atlantic League in 1949, had been a member of the
Tri-County Conference from 2014 to 2020, returning to the Cape-Atlantic League for the 2020–21 school year. With 1,071 students in grades 10–12, the school was classified by the NJSIAA for the 2019–20 school year as Group IV for most athletic competition purposes, which included schools with an enrollment of 1,060 to 5,049 students in that grade range. The football team competes in the Memorial Division of the 94-team
West Jersey Football League superconference and was classified by the NJSIAA as Group IV South for football for 2024–2026, which included schools with 890 to 1,298 students. The softball team won the Group I state championship in 1980 (defeating
Roselle Park High School in the tournament final) and the Group II title in 1986 (vs.
Jefferson Township High School). After losing in the finals in both 1977 and 1979, the 1980 team used seven runs scored in the second inning to carry them to the program's first state title with a 7–2 victory in the Group I championship game against Roselle Park played at
Mercer County Park. The 1986 team finished the season with a 30–3 record after taking the Group I title with a 4–1 win in extra innings against Jefferson Township in the championship game. The team won the 2007 South, Group III state sectional championship with a 6–5 win over
Central Regional High School. The football team won the NJSIAA South Jersey Group II state sectional championship in 1985, 1993, 1994 and 1996, won the South Jersey Group III sectional in 2009 and the Central Jersey Group IV title in 2019. In its seventh year in the playoffs, the 1985 team won the program's first title after defeating
Haddon Heights High School in the South Jersey Group II championship game to end the season with a 9–2 record. The team won the 2009 South Jersey Group III sectional championship with a 23–17 win over
Timber Creek Regional High School, the program's first Group III title. The 2019 team won the Central Jersey Group IV title with a 28–12 win against
Jackson Memorial High School. The girls' field hockey team won the South Jersey Group II state sectional title in 1996 and lost to
West Essex High School in the Group II finals. The boys' wrestling team won the South Jersey Group III state sectional championship in 2009. ==Marching band==