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 Imani Quiñones. 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.