Enrollment
1,375
Illinois · 2024-25 NCES data
High school (grades 9-12) · Grayslake, IL
Grayslake Central High School
Federal NCES profile for Grayslake Central High School, including enrollment, faculty, free-lunch eligibility, demographics, and resource indicators - Resource Investment Index 63/100.
2024-25 NCES dataHigh school (grades 9-12)NCES 171755002057
👥 S:T ratio 46
📚 AP courses 100
🌟 Gifted program 70
🎓 Counselors 50
📋 Attendance 47
Scored 0–100 from federal NCES and CRDC indicators, resource allocation, not test scores. Full methodology →
The verdict
Grayslake Central High School earns 63/100 on the Resource Investment Index, with class sizes near the Illinois median. It is also one of the largest schools in Illinois.
- #1 of 7
- public schools in Grayslake · Resource Index
- 63
- Resource Index · Higher
- 13.5:1
- students per teacher
- 1,375
- students enrolled
Grayslake Central High School has class sizes near the Illinois median. Computed live against every Illinois school reporting to NCES.
By Resource Investment Index, Grayslake Central High School ranks #1 of 7 public schools in Grayslake, IL.
School address
District: Grayslake Chsd 127 · Illinois
NCES ID 171755002057 Verify on NCES CCD record →
Teachers (FTE)
102.0
Federal CCD staff survey
Students per teacher
13.5:1
vs 14:1 Illinois avg
-4% vs state
Student-teacher ratio in context
How Grayslake Central High School compares with Illinois and U.S. medians
What stands out at Grayslake Central High School
Grayslake Central High School is a large high school in Grayslake, Illinois, enrolling 1,375 students.
At 13.5:1, 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 96% of state schools at 1,375 students.
Its Resource Investment Index lands in the upper third of 3,845 scored Illinois schools.
Its student body is led by White (58%) and Hispanic or Latino (22%), more mixed than most schools in the state (diversity index 60/100).
On the academic-pipeline side it reports 23 Advanced Placement courses.
Counselor coverage is strong, about 250 students per counselor, inside the American School Counselor Association's recommended 250:1.
Attendance runs somewhat below the norm, with 21.2% of students chronically absent per the 2021-22 civil-rights collection.
The surrounding Grayslake Chsd 127 spends $23,806 per pupil, 40% above the Illinois average, a better-resourced district than most.
The federal civil-rights collection also records 1 expulsion at this campus for 2021-22.
Among Grayslake's high schools, it stands alongside Grayslake North High School (1,208 students): Grayslake Central High School is larger than that campus by headcount and runs heavier classes (13.5:1 vs 12.7:1).
Its district, Grayslake Chsd 127, also runs Grayslake North High School (1,208 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 Grayslake Central High School compares
Grayslake Central 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 | 13.5:1 | ▼ 4% | 14:1 | 15.7:1 |
| Enrollment | 1,375 | top 4% | - | - |
Source: NCES Common Core of Data School-level CCD + state/national means from Public School Universe · 2024-25
13.5:1
Leaner classes than 62% of US schools, a middle-of-the-pack class size.
1,375
Bigger than 95% of US schools by enrollment, a large campus nationally.
Equity indicators (what these measure)
Staffing depth
13.5:1
students per teacher
- 4% below state mean
Top 49% in Illinois - lower ratio than 51% of state schools
Close to the 15:1 benchmark most often cited for individualized attention.
Engagement
21.2%
chronically absent (missed 10%+ of school days)
At or above 20%, the commonly used threshold for "high" chronic absenteeism, signaling significant barriers to regular attendance.
Funding equity
$23,806
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
Counselors5.5 FTE
Per 250 students, the combined health-and-guidance staffing load for this school.
Discipline context
61
in-school suspensions + 37 out-of-school
Suspension rate: 4.4 per 100 students. Combined in-school and out-of-school rate: 7.1 per 100 students. Reported via the Civil Rights Data Collection. Includes 1 expulsion.
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 57.9%
Hispanic or Latino 22.4%
Asian 7.9%
African American 6.5%
Two or More 5.2%
American Indian / Alaska Native 0.1%
Largest group: White at 57.9% of enrollment.
Student-body diversity index 60.1/100
Simpson diversity index - at 60.1, Grayslake Central High School is more mixed than the Illinois school average of 38.9.
Programs
AP courses offered 23
Gifted & talented Yes
Funding & spending
District-wide per-pupil expenditure for Grayslake Chsd 127, which includes Grayslake Central High School.
$23,806
Per student
+40%
vs Illinois
Avg $17,042
+43%
vs U.S.
Avg $16,593
Revenue mix
Local 59.9%
State 36.3%
Federal 3.8%
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 Grayslake Central High School Compares to District-Mates
| School | Enrollment | Economic Profile | Student-Teacher Ratio |
|---|---|---|---|
| Grayslake North High School | Similar size | No free-lunch data | Similar S:T ratio |
Comparisons are relative to Grayslake Central High School's own figures; each column derives from NCES Common Core of Data.
Other Schools in This District
- Enrollment
- 1,208
- Students per teacher
- 12.7:1
- Resource Index
- 48/100
Similar high schools in Grayslake
1 comparable high schools (grades 9-12) serving the same city.
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 (~1,375 students)
Next steps
Verify locally before acting on Grayslake Central High School's federal record.
- Compare Grayslake Central High School against another school. Compare schools
- Grayslake Chsd 127'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 Grayslake Central High School
How many students attend Grayslake Central High School?
Grayslake Central High School has 1,375 students enrolled. It is a high school in Grayslake, IL.
What is the student-teacher ratio at Grayslake Central High School?
The student-teacher ratio at Grayslake Central High School is 13.5:1, which is 4% lower than the Illinois average of 14:1 and 14% lower than the national average of 15.7:1. Lower ratios generally mean more individual attention per student.
What is the racial and ethnic makeup of Grayslake Central High School?
The largest demographic group at Grayslake Central High School is White at 57.9% of enrollment, in Grayslake, IL. Its student body is more racially and ethnically mixed than most US schools, with a diversity index of 60.1/100.
What is the Resource Investment Index for Grayslake Central High School?
Grayslake Central High School has a Resource Investment Index of 63/100 (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 Grayslake Central High School rank among public schools in Grayslake?
By Resource Investment Index, Grayslake Central High School ranks #1 of 7 public schools in Grayslake, 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 Grayslake on the city page.
Is Grayslake Central High School a good school?
Grayslake Central High School earns 63/100 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 Grayslake Chsd 127?
Besides Grayslake Central High School, Grayslake Chsd 127 also operates Grayslake North High School (1,208 students). See the Grayslake Chsd 127 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.