[6] The school district gets its name from its location just off Delsea Drive, which runs from Westville on the Delaware River to Wildwood on the Jersey shore, hence the name Del-Sea.

[15] Delsea Regional High School's Drama program has included The Little Mermaid (2017), The Wedding Singer (2016), Grease (2015), Shrek (2015), All Shook Up (2013), Legally Blonde (2012), Hairspray (2011), Annie (2010), Footloose (2009), The Wizard of Oz (2008), Beauty and the Beast (2007), Grease (2006), West Side Story (2005), Into the Woods (2004), My Fair Lady (2003), Oliver!

[23] The team won the South Jersey Group III championship in 2005 with an 8–6 win against Lower Cape May Regional High School.

[26] The 1976 team finished the season with an 11–0 record after winning the South Jersey Group II sectional title with a 14–6 victory against Pleasantville High School in the playoff finals.

[27] A late touchdown gave the 1982 team a 20–12 win against Salem High School in the South Jersey Group II sectional championship game and a 10–0–1 record for the season.

[31] The 2005 football team won the South, Group III state sectional title with a 21–6 win against Lacey Township High School.

[34][35] The team won its fourth consecutive title in 2015 with a 21–12 win against Camden High School in the South Jersey Group III tournament final.

[39] The boys' basketball team won the Group II state title in 1991, defeating runner-up Hillside High School in the finals of the tournament.

[40] Delsea won the girls' Group III state soccer championship in 1993 with a win in the tournament final over Ramsey High School.

[41] The 1994 girls' basketball team won the Group III state championship with a 53–42 victory against Morris Knolls High School in the final of the tournament.