Summary:
Zip code 30126 in Mableton, Georgia, is served by a single large high school, Pebblebrook High School, which enrolls 2,574 students in grades 9–12 and operates within the Cobb County School District.
Pebblebrook High School is a high-poverty school, with 96.46% of students qualifying for free or reduced lunch, and it has shown meaningful improvement in recent years. The school’s statewide ranking jumped from the 46th percentile (2 stars) in 2024–2025 to the 59th percentile (3 stars) in 2025–2026, a rise of 57 positions. However, significant challenges remain. The graduation rate is 75.7%, which is 13.5 points below the state average of 87.2%, and the dropout rate of 6.1% is more than double the state rate. Chronic absenteeism is also a major concern, affecting 34.3% of students—nearly double the state average of 17.7%—which likely hinders overall achievement.
Academically, the school shows a mixed picture. In the most recent End-of-Course tests, Pebblebrook outperformed the state in U.S. History, with 48.9% proficient compared to the state’s 38.5%, and made a dramatic 12.6-point gain in Biology, reaching 45.3% proficiency. However, Algebra I proficiency fell sharply to 25.3%, a 23-point gap behind the state average of 48.1%. The school spends a relatively high $14,156 per student, reflecting the investment in support services for its high-need population, but the student-teacher ratio of 17.1:1 is slightly above the state average. English Language Arts scores are not yet available for this release and will be published in December, so a complete academic assessment is pending. Overall, this is a school on an upward trajectory with notable strengths in social studies and science, but it still faces substantial hurdles in math, attendance, and graduation outcomes.
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