Dennis-Yarmouth Regional High School is a suburban public high school (grades 8–12) in Yarmouth, Massachusetts, United States. It opened in 1957 and was expanded and renovated in 1979, and again in 2006. The school serves the communities of Yarmouth and Dennis, and has an enrollment of approximately 900 students. Dennis-Yarmouth, or known more commonly to the locals as "D-Y",... Wikipedia