Crystal Lake South High School
🇺🇸 Official data · 2025Crystal Lake, Illinois 60014 · Chsd 155
#104 of 691 high schools in Illinois
#7089 of 16,910 nationally
About Crystal Lake South High School
Crystal Lake South High School is a public high located in Crystal Lake, in the Chsd 155 school district of Illinois, United States. It caters for Grades 9–12. In 2025 it enrolled 1,279 students. Traditional public schools run by a school district; free to attend.
Its Success Index (US) is 54.8 out of 100, placing it in the top 50% of high schools in United States and 104th of 691 ranked high schools in Illinois. Its strongest component is community advantage (fewer free/reduced-price lunch) (78th percentile), and its weakest is students per teacher (37th percentile).
Other published figures: enrollment 1,279.
There are 18 schools in Crystal Lake; Crystal Lake South High School ranks 12th of 17 scored schools there.
Success Index (US) breakdown
Each component is a percentile against high schools across United States.
- Math proficiency (30%)47%
- Reading proficiency (30%)47%
- Community advantage (fewer free/reduced-price lunch) (25%)32.1%
- Students per teacher (15%)16.6
The Success Index (US) summarises published data about a school community. It is not a measure of teaching quality. Read the methodology.
Published measures
All figures published for Crystal Lake South High School by the official sources.
- Enrollment
- 1,279
- Students enrolled in the latest NCES directory year.
- Free/reduced-price lunch
- 32.1%
- Share of students eligible for free or reduced-price lunch.
- Students per teacher
- 16.6
- Enrollment divided by FTE teachers; not class size.
- Reading proficiency
- 47%
- Share of tested students proficient or above (all students, all grades).
- Math proficiency
- 47%
- Share of tested students proficient or above (all students, all grades).
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Schools near Crystal Lake South High School
Closest schools by straight-line distance, with their Success Index (US).
Coventry Elem School
Crystal Lake · Public elementary · Grades K–5
629 students · 1.2 km away
Lundahl Middle School
Crystal Lake · Public middle · Grades 6–8
797 students · 1.5 km away
Canterbury Elem School
Crystal Lake · Public elementary · Grades K–5
486 students · 1.8 km away
South Elem School
Crystal Lake · Public elementary · Grades K–5
390 students · 1.9 km away
Indian Prairie Elem School
Crystal Lake · Public elementary · Grades PK–5
496 students · 2.0 km away
Woods Creek Elementary School
Crystal Lake · Public elementary · Grades K–5
489 students · 2.0 km away
Glacier Ridge Elementary School
Crystal Lake · Public elementary · Grades PK–5
360 students · 2.5 km away
Glacier Ridge Prek
Crystal Lake · Public other · Grades PK–PK
0 students · 2.5 km away
Crystal Lake Central High School
Crystal Lake · Public high · Grades 9–12
1,443 students · 3.3 km away
Husmann Elem School
Crystal Lake · Public elementary · Grades K–5
518 students · 3.4 km away
Similar schools
Public high schools in Illinois with a comparable Enrollment.
Lemont Twp High School
Lemont · Public high · Grades 9–12
1,284 students
Solorio Academy High School
Chicago · Public high · Grades 9–12
1,287 students
East St Louis Senior High School
East Saint Louis · Public high · Grades 9–12
1,288 students
Payton College Preparatory HS
Chicago · Public high · Grades 9–12
1,260 students
Danville High School
Danville · Public high · Grades 9–12
1,253 students
Springfield High School
Springfield · Public high · Grades 9–12
1,308 students
Frequently asked questions
Is Crystal Lake South High School a good school?
Crystal Lake South High School has a Success Index (US) of 54.8 out of 100 (Top 50% of high schools in United States) and ranks #104 of 691 in Illinois. The index summarises published data about the school community and, where available, attainment; it does not measure teaching quality, so visit the school and ask about support at your child's level.
Where does Crystal Lake South High School rank in Illinois?
Crystal Lake South High School ranks #104 of 691 high schools in Illinois and #7089 of 16,910 nationally on the Success Index (US) (2025 data).
How many students attend Crystal Lake South High School?
Crystal Lake South High School had 1,279 students in 2025.
Is Crystal Lake South High School a elementary school or a high school?
Crystal Lake South High School is classified as a high covering Grades 9–12. It is a public school.
What other schools are near Crystal Lake South High School?
There are 10 schools within 15 km of Crystal Lake South High School; they are listed on this page with their Success Index (US) and distance, and can be compared side by side.