School overview
At a glance
Reported students
1,279
NCES CCD 2024–25, where reported
Teachers (FTE)
77.67
NCES CCD 2024–25
Student–teacher ratio
16.5:1
Calculated, not a class-size measure
Grades served
09–12
NCES preliminary directory 2025–26
School benchmarks
Illinois high enrollment
82th percentile
Compared with 966 same-level schools reporting enrollment.
District median enrollment
1,279
Crystal Lake South High School: 1,279 reported students.
State peer staffing position
88th percentile
16.5:1 reported; state peer median 12.6:1. Ratio is not class size.
Profile interpretation
What the reported data says about Crystal Lake South High School
Crystal Lake South High School is a public high school serving grades 09–12 in Crystal Lake. It is one of 5 current school records connected to CHSD 155. NCES reports 1,279 students for 2024–25.
Among 966 high schools in Illinois with comparable records, this school is larger than the reported median of 254 students. Its enrollment is at approximately the 82th percentile for that peer group. Size describes the campus, not instructional quality.
The reported student–teacher ratio is 16.5:1, above the Illinois median of 12.6:1 for the same school level. This ratio uses total enrollment and teacher FTE; it is not an average classroom headcount and can be affected by special programs or part-time staffing.
The two largest reported race and ethnicity groups are White (64.9%) and Hispanic or Latino (25.7%). English learners represent 4.4% of enrollment. Students served under IDEA represent 11.3%. These figures help families understand who the school serves; they are not rating inputs.
The 2021–22 civil-rights collection reports access to Advanced Placement, computer science. The school reported 20 AP courses. Program availability changes, so families should confirm the current catalog and participation rules directly with the school.
Turn data into a school visit
Questions worth asking Crystal Lake South High School
- 1How do the reported 16.5:1 student–teacher ratio and 77.67 teacher FTE translate into actual class sizes by grade?
- 2Have the reported academic programs changed since the 2021–22 CRDC collection?
- 3How are the school's 5 counselor FTE allocated across grades and student needs?
- 4What meal assistance, transportation, after-school, and family-support services are currently available?
Student context
Enrollment needs
- English learners
- 4.4%
- Students with disabilities
- 11.3%
- Free/reduced-price lunch
- 32.1%
- Lunch program
- Yes participating without using any Provision or the CEO
People available to students
Support staff
- Counselors (FTE)
- 5
- Nurses (FTE)
- 2
- Psychologists (FTE)
- 1
- Social workers (FTE)
- 2
Student demographics
Race and ethnicity share of reported enrollment
- White64.9%
- Hispanic25.7%
- Black2.7%
- Asian4.3%
- American Indian / Alaska Native0.3%
- Native Hawaiian / Pacific Islander0%
- Multiracial2%
Race/ethnicity: NCES CCD 2024–25 where reported, otherwise CRDC 2021–22. English learner and disability context: CRDC 2021–22. Privacy rules can produce missing values.
Learning opportunities
Programs reported by the school
Advanced Placement
Offered
20 courses reported
Gifted and talented
Not reported as offered
Computer science
Offered
Program availability is from CRDC 2021–22 and can change. Confirm current courses and eligibility with the school.
Continue exploring
Other schools in CHSD 155
Start with campuses at the same school level or with similar reported enrollment.
Cary-Grove Community High School
High · Grades 09–12
1,348 reported students
Prairie Ridge High School
High · Grades 09–12
1,133 reported students
Crystal Lake Central High School
High · Grades 09–12
1,443 reported students
Haber Oaks Campus
High · Grades 09–12
0 reported students