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Crystal Lake South High School

1200 S McHenry Ave, Crystal Lake, IL 60014

ASchola Grade
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Grades
9–12
High
Students
1,279
Enrolled 2024–25
Students per teacher
16.5 : 1
Full-time teachers
District
Chsd 155
McHenry County

Schola Grade A · Excellent

Letter grade (A–F) · compared with 684 Illinois high schools · How we grade
Test scores41% proficient in math & reading
86thpercentile
Equity24% of low-income students proficient
82ndpercentile
Attendance23% chronically absent
72ndpercentile
Graduation rate94% graduate in 4 years
77thpercentile
College readinessAt least 42% take AP, IB or dual-enrollment courses
87thpercentile
Class size16.5 students per teacher
15thpercentile

Percentiles compare this school with other Illinois high schools; the line marks the middle. Data: test scores 2021–22, graduation and absenteeism 2022–23 (U.S. Department of Education, EDFacts); coursework 2023–24 (Civil Rights Data Collection); staffing 2024–25 (NCES).

About Crystal Lake South High School

Crystal Lake South High School is a public high school in Crystal Lake, Illinois, serving grades 9–12. It is part of Chsd 155. The school is located in a large suburb in McHenry County.

In the 2024–25 school year, 1,279 students were enrolled, with about 16.5 students for every full-time teacher. That ratio is larger than the typical Illinois high school (13.3 students per teacher). Its Schola Grade is A (excellent), compared with 684 Illinois high schools.

Grades & enrollment

Students per grade, 2024–25Grades 9–12

Location & nearby schools

1200 S McHenry Ave
Crystal Lake, IL 60014
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School details

Type
Public School · What this means
Level
High
Grades offered
9–12
Enrollment (2024–25)
1,279 students
Students per teacher
16.5 to 1
AP courses offered
18
Charter school
No
Magnet school
No
Locale
Suburb — Large
School district
Chsd 155
County
McHenry County
NCES school ID
171137001368

Schools near Crystal Lake South High School

All 23 schools in Crystal Lake →

School data comes from the U.S. Department of Education: the National Center for Education Statistics (NCES) Common Core of Data and EDGE school locations (2024–25) and Private School Survey (2023–24), the Civil Rights Data Collection (2023–24), and EDFacts (test results 2021–22; graduation and chronic absenteeism 2022–23), plus other public sources. Please contact the school to confirm enrollment, programs, and other details. How we source data.