Crystal Lake Central High School, often referred to as "Central" or "CLC," is the oldest of the three high schools in Crystal Lake, Illinois, United States.
Serving 1,443 students in grades 9-12, Crystal Lake Central High School ranks in the top 50% of all schools in Illinois for overall test scores (math proficiency is top 50%, and reading proficiency is top 50%).
The percentage of students achieving proficiency in math is 31% (which is higher than the Illinois state average of 27%). The percentage of students achieving proficiency in reading/language arts is 34% (which is higher than the Illinois state average of 30%).
The student-teacher ratio of 17:1 is higher than the Illinois state level of 13:1.
Minority enrollment is 36% of the student body (majority Hispanic), which is lower than the Illinois state average of 55% (majority Hispanic).
Quick Facts (2026)
- Grades: 9-12
- Enrollment: 1,443 students
- Student-Teacher Ratio: 17:1
- Minority Enrollment: 36%
- Graduation Rate: 96% (Top 5% in IL)
- Overall Testing Rank: Top 50%
- Math Proficiency: 31% (Top 50%)
- Reading Proficiency: 34% (Top 50%)
- Science Proficiency: 61% (Top 50%)
- Source: National Center for Education Statistics (NCES), IL Dept. of Education
Top Rankings
Crystal Lake Central High School ranks among the top 20% of public schools in Illinois for:
Category
Attribute
Most improved public schools
Graduation Rate
School Overview
Crystal Lake Central High School's student population of 1,443 students has stayed relatively flat over five school years.
The teacher population of 85 teachers has stayed relatively flat over five school years.
Grades Offered
Grades 9-12
Total Students
1,443 students
Total Classroom Teachers
85 teachers
Year Founded
1924
Colors
Black, Orange
School Calendar
School Rankings
Crystal Lake Central High School ranks within the top 50% of all 3,542 schools in Illinois (based off of combined math and reading proficiency testing data).
The diversity score of Crystal Lake Central High School is 0.51, which is less than the diversity score at state average of 0.69. The school's diversity has stayed relatively flat over five school years.
Overall Testing Rank
#1188 out of 3542 schools
(Top 50%)
(Top 50%)
Math Test Scores (% Proficient)
31%
27%
Reading/Language Arts Test Scores (% Proficient)
34%
30%
Science Test Scores (% Proficient)
61%
50%
Student-Teacher Ratio
17:1
13:1
Asian
3%
6%
Hispanic
28%
29%
Black
2%
16%
White
64%
45%
Two or more races
3%
4%
All Ethnic Groups
Graduation Rate
96%
87%
Chronically Absent Students
(22-23)29.7%
29.7%
Eligible for Free Lunch
22%
43%
Eligible for Reduced Lunch
7%
4%
School Statewide Testing
School District Name
Source: National Center for Education Statistics (NCES), IL Dept. of Education
School Notes
- School Mascot: Crystal Lake Tiger
Frequently Asked Questions
What is Crystal Lake Central High School's ranking?
Crystal Lake Central High School is ranked #1188 out of 3,542 schools, which ranks it among the top 50% of public schools in Illinois.
What schools are Crystal Lake Central High School often compared to?
Crystal Lake Central High Schoolis often viewed alongside schools like Prairie Ridge High School, Crystal Lake South High School, Cary-grove Community High School by visitors of our site.
What percent of students have achieved state testing proficiency in math and reading?
31% of students have achieved math proficiency (compared to the 27% IL state average), while 34% of students have achieved reading proficiency (compared to the 30% IL state average).
What is the graduation rate of Crystal Lake Central High School?
The graduation rate of Crystal Lake Central High School is 96%, which is higher than the Illinois state average of 87%.
How many students attend Crystal Lake Central High School?
1,443 students attend Crystal Lake Central High School.
What is the racial composition of the student body?
64% of Crystal Lake Central High School students are White, 28% of students are Hispanic, 3% of students are Asian, 3% of students are Two or more races, and 2% of students are Black.
What is the student-teacher ratio of Crystal Lake Central High School?
Crystal Lake Central High School has a student ration of 17:1, which is higher than the Illinois state average of 13:1.
What grades does Crystal Lake Central High School offer ?
Crystal Lake Central High School offers enrollment in grades 9-12
What school district is Crystal Lake Central High School part of?
Crystal Lake Central High School is part of CHSD 155 School District.
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