Pebblebrook High School is a high school in the Cobb County School District in Mableton, Georgia. It was opened in 1963 and the current principal is Mr. Travis Joshua. approx. 3,000 students in grades 9-12 attend Pebblebrook and 183 teachers are employed there. This makes Pebblebrook High School the biggest school in the Cobb County School District according to student body. The school's traditional archrival is South Cobb High School.