Glenbrook South High School

Glenbrook South High School operates as a big secondary school in Glenview, Illinois, operated by Glenbrook HSD 225. Current enrollment sits at 2,923 students spanning grades 9 through 12. By comparison, Illinois's public schools average about 834 students each, so Glenbrook South High School sits 250% larger than that benchmark.

Across the 2 schools in Glenbrook HSD 225 (5,034 students total), Glenbrook South High School accounts for its share of the district's footprint.

Demographically, Glenbrook South High School records that 54% of students identify as White, with the remaining enrollment distributed across several groups. Other groups include 23% Asian, 16% Hispanic, 5% multiracial. By comparison, Cook County as a whole is about 44% White, so the school skews visibly more White than its surroundings.

On the income-and-resources front, On paper, Glenbrook South High School has 227 full-time-equivalent teachers, translating to a class-load average of around 12.9:1. The state averages around 13.8:1, so this campus is tighter than the state norm typical.

In the area at large, the surrounding county (Cook County) logs that the typical household earns roughly $83,498 per year, 43% of adults hold a bachelor's degree or higher, and census figures put the poverty rate at about 10%. Glenbrook South High School is one of 1406 public schools in Cook County (combined enrollment of about 697,934 students).

Nearest neighbor: Henry Winkelman Elem School, around 0.5 miles off. Counting just inside five miles, 8 other public schools cluster around Glenbrook South High School.

Geographically, the school is in a bedroom-community area.

Over the past 7-year window. Looking back 7 years, enrollment at Glenbrook South High School has declined 5%, going from 3,067 students in 2018 to 2,923 in 2025. The White share of enrollment decreased from 63% to 54% over that span. The student-to-teacher ratio tightened from 16.3:1 in 2018 to 12.9:1 today.

On allk12, recent activity here tends to focus on pickup logistics, teacher feedback, and after-school programs. Parents, students, alumni, and staff are welcome to weigh in.