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A−

Crystal Lake South High School

PublicHighGrades 9–12

1200 S McHenry Ave, Crystal Lake, IL 60014 · (815) 455-3860 · Part of Community High School District 155

Algonquin Township’s School Grade B+ better than 70% of Illinois school districts

Directions
Students
1,279
Students per teacher
16:1
Free or reduced lunch
32%
Setting
Suburb
Grades
9–12
The gist

What stands out about Crystal Lake South High School

  • Its own letter, A−: reading and math results near the top of Illinois’s public schools
  • Math proficiency 10 pts above the state
  • Enrollment down 9.3% since 2020–21

On the path

Where Algonquin Township kids come from and go next. The whole path →

6–84 middle schoolsDepends on your address
9–12Crystal Lake South High SchoolYou are here

Test scores

2020–21
Math proficiency36%
State average 25.9%
Reading / language arts35%
State average 30.7%

Its own letter, A−, places these results among Illinois’s 3,406 public schools with results. Source: EDFacts via Urban Institute Education Data Portal (SY2020-21).

Location

Directions ↗

1200 S McHenry Ave, Crystal Lake

Students

Enrollment by grade
Grade 9311
Grade 10327
Grade 11305
Grade 12336
Enrollment over time
1,410’20
1,357’21
1,301’22
1,291’23
1,279’24

Down 9.3% since 2020–21.

Who goes here
White 65%Hispanic 26%Asian 4%Black 3%Two or more races 2%American Indian/Alaska Native <1%

As reported to NCES, share of students with a reported race or ethnicity.

Parents talk

Questions and answers about Crystal Lake South High School from Algonquin Township families.

Other schools in Community High School District 155

The district →
Crystal Lake Central High School
High · Grades 9–12 · Crystal Lake
B+
1,443 students17:1
Cary-Grove Community High School
High · Grades 9–12 · Cary
A
1,348 students18:1
Prairie Ridge High School
High · Grades 9–12 · Crystal Lake
A
1,133 students16:1

School facts: U.S. Department of Education (NCES), 2024–2025 school year. Test scores: EDFacts via Urban Institute Education Data Portal (SY2020-21). A school’s letter is our own summary of its reading and math results against Illinois’s other public schools; Algonquin Township’s School Grade is built from its districts’ results. Map: © OpenStreetMap contributors.