Enrollment
2,111
Illinois · 2024-25 NCES data
High school (grades 9-12) · Northbrook, IL
Glenbrook North High School
Federal NCES profile for Glenbrook North High School, including enrollment, faculty, free-lunch eligibility, demographics, and resource indicators - Resource Investment Index 57/100.
2024-25 NCES dataHigh school (grades 9-12)NCES 172901003042
👥 S:T ratio 44
📚 AP courses 100
🌟 Gifted program 30
🎓 Counselors 50
📋 Attendance 62
Scored 0–100 from federal NCES and CRDC indicators, resource allocation, not test scores. Full methodology →
The verdict
Glenbrook North High School earns 57/100 on the Resource Investment Index, with class sizes near the Illinois median. It is also one of the largest schools in Illinois.
- #11 of 11
- public schools in Northbrook · Resource Index
- 57
- Resource Index · Higher
- 14.1:1
- students per teacher
- 2,111
- students enrolled
Glenbrook North High School has class sizes near the Illinois median. Computed live against every Illinois school reporting to NCES.
By Resource Investment Index, Glenbrook North High School ranks #11 of 11 public schools in Northbrook, IL.
School address
District: Glenbrook Hsd 225 · Illinois
NCES ID 172901003042 Verify on NCES CCD record →
Teachers (FTE)
150.0
Federal CCD staff survey
Students per teacher
14.1:1
vs 14:1 Illinois avg
+1% vs state
Student-teacher ratio in context
How Glenbrook North High School compares with Illinois and U.S. medians
What stands out at Glenbrook North High School
Glenbrook North High School is a large high school in Northbrook, Illinois, enrolling 2,111 students.
At 14.1:1, its student-teacher ratio sits close to the Illinois median, within a few percentage points of the 14:1 state norm, neither notably crowded nor notably small.
By headcount it is one of the larger campuses in Illinois, bigger than 98% of state schools at 2,111 students.
Its Resource Investment Index lands in the upper third of 3,845 scored Illinois schools.
Its student body is led by White (66%) and Asian (23%) (diversity index 51/100).
On the academic-pipeline side it reports 22 Advanced Placement courses.
Counselor coverage runs a bit thin, about 251 students per counselor, somewhat past the ASCA-recommended 250:1 benchmark.
15.4% of students were chronically absent in the 2021-22 collection, in line with the post-pandemic national range.
The surrounding Glenbrook Hsd 225 spends $29,799 per pupil, 75% above the Illinois average, a better-resourced district than most.
Its district, Glenbrook Hsd 225, also runs Glenbrook South High School (2,923 students).
Sourced from NCES CCD, CRDC, and F-33 (federal records, not a quality verdict). How we source and compute this.
Source: National Center for Education Statistics Common Core of Data + CRDC + F-33 · 2024-25
How Glenbrook North High School compares
Glenbrook North High School on the metrics families compare, against Illinois and U.S. means.
| Metric | This school | vs Illinois | Illinois avg | U.S. avg |
|---|---|---|---|---|
| Students per teacher | 14.1:1 | ▲ 1% | 14:1 | 15.7:1 |
| Enrollment | 2,111 | top 2% | - | - |
Source: NCES Common Core of Data School-level CCD + state/national means from Public School Universe · 2024-25
14.1:1
Leaner classes than 56% of US schools, a middle-of-the-pack class size.
2,111
Bigger than 98% of US schools by enrollment, a large campus nationally.
Equity indicators (what these measure)
Staffing depth
14.1:1
students per teacher
- 1% above state mean
Top 58% in Illinois - lower ratio than 42% of state schools
Close to the 15:1 benchmark most often cited for individualized attention.
Engagement
15.4%
chronically absent (missed 10%+ of school days)
In the 15-20% range, nearing the "high" absenteeism threshold.
Funding equity
$29,799
per pupil, district-wide
- above Illinois avg of $17,042
Well above the U.S. public-school average, reflecting substantially higher local or state investment per enrolled student.
Support staff
Counselors8.4 FTE
Per 251 students, the combined health-and-guidance staffing load for this school.
Discipline context
20
in-school suspensions + 8 out-of-school
Suspension rate: 0.9 per 100 students. Combined in-school and out-of-school rate: 1.3 per 100 students. Reported via the Civil Rights Data Collection.
Overview
- Common Core of Data (June 2026): enrollment, staffing, and the student-teacher ratio above.
- Civil Rights Data Collection: discipline counts and program access (AP, gifted, special education).
- F-33 School District Finance Survey: the district-wide per-pupil spending figures below.
Three separate federal collections, each on its own reporting cadence - which is why this school's numbers line up on a consistent basis against every other school and state on this site, rather than mixing figures pulled from different survey years.
Student demographics
White 66.1%
Asian 22.5%
Hispanic or Latino 5.2%
Two or More 4.9%
African American 0.9%
Native Hawaiian / Pacific Islander 0.3%
Largest group: White at 66.1% of enrollment.
Student-body diversity index 50.7/100
Simpson diversity index - at 50.7, Glenbrook North High School is more mixed than the Illinois school average of 38.9.
Programs
AP courses offered 22
Funding & spending
District-wide per-pupil expenditure for Glenbrook Hsd 225, which includes Glenbrook North High School.
$29,799
Per student
+75%
vs Illinois
Avg $17,042
+80%
vs U.S.
Avg $16,593
Revenue mix
Local 78.4%
State 18.6%
Federal 3.0%
Source: NCES F-33 School District Finance Survey District-level finance · FY 2021-22 Per-pupil expenditure reflects the district-wide average. Individual school budgets are not reported at the federal level.
How Glenbrook North High School Compares to District-Mates
| School | Enrollment | Economic Profile | Student-Teacher Ratio |
|---|---|---|---|
| Glenbrook South High School | Larger | No free-lunch data | Similar S:T ratio |
Comparisons are relative to Glenbrook North High School's own figures; each column derives from NCES Common Core of Data.
Other Schools in This District
- Enrollment
- 2,923
- Students per teacher
- 13.2:1
- Resource Index
- 41/100
Similar high schools statewide
Matched by enrollment size and by staffing ratio across all of Illinois, not just this city - a different peer set than the local comparisons above.
Similar enrollment (~2,111 students)
Next steps
Verify locally before acting on Glenbrook North High School's federal record.
- Compare Glenbrook North High School against another school. Compare schools
- Glenbrook Hsd 225's spending and staffing shape this school. District profile
- Confirm current enrollment and boundaries with the school. Choosing guide
Federal record (CCD 2024-25, CRDC 2021-22) - PlainSchools assigns no subjective rating; the composite quality score is a transparent, reproducible index computed from this cited federal data.
Frequently asked questions about Glenbrook North High School
How many students attend Glenbrook North High School?
Glenbrook North High School has 2,111 students enrolled. It is a high school in Northbrook, IL.
What is the student-teacher ratio at Glenbrook North High School?
The student-teacher ratio at Glenbrook North High School is 14.1:1, which is 1% higher than the Illinois average of 14:1 and 10% lower than the national average of 15.7:1.
What is the racial and ethnic makeup of Glenbrook North High School?
The largest demographic group at Glenbrook North High School is White at 66.1% of enrollment, in Northbrook, IL. Its student body is more racially and ethnically mixed than most US schools, with a diversity index of 50.7/100.
What is the Resource Investment Index for Glenbrook North High School?
Glenbrook North High School has a Resource Investment Index of 57/100 (higher reported resources relative to schools nationally) based on 5 factors: student-teacher ratio, AP course offerings, counselor availability, attendance rates. Not a test-score or academic measure (national median ~41/100, see methodology).
How does Glenbrook North High School rank among public schools in Northbrook?
By Resource Investment Index, Glenbrook North High School ranks #11 of 11 public schools in Northbrook, IL. This compares federal resource and staffing data among local peers; it is not a test-score or academic ranking. See all public schools in Northbrook on the city page.
Is Glenbrook North High School a good school?
Glenbrook North High School earns 57/100 on the Resource Investment Index, with class sizes near the Illinois median. It is also one of the largest schools in Illinois. This is a resource snapshot, not an academic rating; see the Resource Investment Index question above for what the number does and doesn't measure.
What other schools are in Glenbrook Hsd 225?
Besides Glenbrook North High School, Glenbrook Hsd 225 also operates Glenbrook South High School (2,923 students). See the Glenbrook Hsd 225 district page for the complete list.
Related tools
Every figure on PlainSchools is rendered directly from the source NCES, CRDC and F-33 federal records, no number is typed in by an editor. Each school's figures reflect its most recent NCES/CRDC submission on file. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of June 2026.