- Enrollment
- 1,208
- Students per teacher
- 12.7:1
- Resource Index
- 48/100
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 53/100.
2024-25 NCES dataHigh school (grades 9-12)NCES 171755002057
👥 S:T ratio 46
🌟 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 53/100 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
- 53
- 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 →
CCD year-over-year · 2022-23 → 2023-24
-44 students YoY
Grayslake Central High School held near 1,375 students from 2022-23 to 2023-24 (-44 headcount).
Teacher FTE added 102.9 → 104.0 across the same CCD years.
Source: NCES Common Core of Data public-school universe (2022-23, 2023-24).
Steady CCD campus
-44 students YoY 171755002057 · Grayslake, IL High · MID · TRAD
1,375 enr · 13.5:1 · RII 53
Nearest enrollment peer: Grayslake North High School (1,208 students)
Grayslake Central High School held near 1,375 students from 2022-23 to 2023-24 (-44 headcount). Teacher FTE added 102.9 → 104.0 across the same CCD years. Read with this school → · District book → · Illinois schools → · Find another →
How Grayslake Central High School compares
Grayslake Central High School held steady on CCD headcount: ratios and free-lunch share vs 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 methodology
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
$25,157
per pupil, district-wide
- above Illinois avg of $18,196
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.
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
District finance for Grayslake Chsd 127 reports $25,157 per pupil (NCES F-33) - open the district page for the full revenue mix.
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
Similar high schools in Grayslake
1 comparable high schools (grades 9-12) serving the same city.
Nationwide high schools with similar size or staffing
Out-of-state peers matched by enrollment and by student-teacher ratio, not the same-city or same-district lists above.
Similar enrollment (~1,375 students)
Similar student-teacher ratio (~13.5:1)
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. CCD year-over-year: 1,419 (2022-23) → 1,375 (2023-24), nearly flat (-44).
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 53/100 (higher reported resources relative to schools nationally) based on 4 factors: student-teacher ratio, gifted-program reporting, counselor availability, chronic absenteeism. 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.
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.