Henderson Middle School 2830 Henderson Mill Rd, Atlanta, GA30341 Henderson Middle School is part of the DeKalb County School System. The school opened in 1996 in the former Henderson…More High School building. Its student population is remarkably diverse with students from more than 30 countries who speak more than 50 languages. Students who graduate Henderson Middle attend Lakeside High School. The elementary schools that feed into it include Hawthorne, Henderson Mill, Pleasantdale, Evansdale, Oak Grove, Briarlake and part of Sagamore Hills.