John McEachern High School or McEachern High School is a public high school established in 1908 in Powder Springs, Georgia, United States. It was originally established as the Seventh District Agricultural and Mechanical School. Due to its history, McEachern has an open campus, with its buildings spaced across the property. It is the largest school in the CCSD, with around 2,500 students, in grades 9-12.