Summary:
Zip code 60026 has one high school, Glenbrook South High School, serving grades 9–12 and enrolling 2,923 students. Its graduation rate is strong and its dropout rate is below the state’s, while chronic absenteeism is lower than the state rate but higher than the district rate. The most important finding is that the school exceeded state proficiency rates in all nine reported 2025–26 subject, grade, and test comparisons, by about 25 to 33 percentage points.
Glenbrook South is the only school in this area, so there is no local school-to-school leader or trailing school. It stands well above the state in every reported test comparison, with its largest average advantage in mathematics: 32 points, compared with 29 in science and 28 in ELA. At the same time, it scored below Glenbrook HSD 225 in all nine comparisons, by 3 to 6 points. Graduation was 98%, 8 points above the state and 1 point above the district; dropout was 2 points below the state. Chronic absenteeism was 21%, 2 points below the state but 3 points above the district.
Results varied by grade and subject, even as the overall picture remained strong: from 2024–25 to 2025–26, grade 10 scores rose in all three subjects, including 6 points in mathematics and 5 in science, while grade 9 science fell 5 points and grade 11 mathematics fell 3. SchoolDigger ranked the school 20th of 620 in 2025–26, up from 21st of 698 in 2024–25 and 26th of 697 in 2023–24; its percentile was 97th in each of the last two years. The student–teacher ratio was 12.8:1 in 2024–25. The school’s free/reduced lunch eligible share was 17% in 2021–22, a context measure from an earlier year than most of these results.
Thank you for your feedback!