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- Welcome to the Haddon Heights School District home page. Our district's Junior-Senior High School serves the communities of Haddon Heights, Barrington, and Lawnside. The three elementary schools serve the students of Haddon Heights. View the Long Range Facilities Plan Presentation to the Board of Education. January 28, 2002. View online or download presentation for offline viewing. Atlantic ...hhsd.k12.nj.us