For the 2026 school year, there are 9 public high schools serving 2,890 students in Williamson County, IL.
The top-ranked public high schools in Williamson County, IL are Carterville High School, Herrin High School and Project Echo. Overall testing rank is based on a school's combined math and reading proficiency test score ranking.
Williamson County, IL public high schools have an average math proficiency score of 18% (versus the Illinois public high school average of 26%), and reading proficiency score of 32% (versus the 29% statewide average). High schools in Williamson County have an average ranking of 7/10, which is in the top 50% of Illinois public high schools.
Williamson County, IL public high school have a Graduation Rate of 85%, which is less than the Illinois average of 87%.
The school with highest graduation rate is Carterville High School, with 90-94% graduation rate. Read more about public school graduation rate statistics in Illinois or national school graduation rate statistics.
Minority enrollment is 19% of the student body (majority Black and Hispanic), which is less than the Illinois public high school average of 55% (majority Hispanic).
Best Public High Schools in Williamson County (2026)
School
(Math and Reading Proficiency)
(Math and Reading Proficiency)
Location
Quick Facts
Rank: #11.
Carterville High School
(Math: 30-34% | Reading: 45-49%)
Rank:
Rank:
8/
Top 30%10
1415 W Grand Ave
Carterville, IL 62918
(618) 985-2940
Carterville, IL 62918
(618) 985-2940
Gr: 9-12 | 668 students Student-teacher ratio: 17:1 Minority enrollment: 20%
Rank: #22.
Herrin High School
(Math: 15-19% | Reading: 25-29%)
Rank:
Rank:
5/
Bottom 50%10
700 N 10th St
Herrin, IL 62948
(618) 942-6606
Herrin, IL 62948
(618) 942-6606
Gr: 9-12 | 662 students Student-teacher ratio: 13:1 Minority enrollment: 16%
Rank: #33.
Project Echo
Alternative School
(Math: ≤20% | Reading: ≤20% )
Rank:
Rank:
5/
Bottom 50%10
17428 Route 37
Johnston City, IL 62951
(618) 983-6628
Johnston City, IL 62951
(618) 983-6628
Gr: 7-12
Rank: #44.
Johnston City High School
(Math: 15-19% | Reading: 20-24%)
Rank:
Rank:
5/
Bottom 50%10
1500 Jefferson Ave
Johnston City, IL 62951
(618) 983-4700
Johnston City, IL 62951
(618) 983-4700
Gr: 9-12 | 328 students Student-teacher ratio: 12:1 Minority enrollment: 11%
Rank: #55.
Marion High School
(Math: 11% | Reading: 30%)
Rank:
Rank:
4/
Bottom 50%10
1501 S Carbon St
Marion, IL 62959
(618) 993-8196
Marion, IL 62959
(618) 993-8196
Gr: 9-12 | 1,075 student Student-teacher ratio: 15:1 Minority enrollment: 24%
Rank: #66.
Crab Orchard High School
(Math: ≤20% | Reading: 11-19%)
Rank:
Rank:
4/
Bottom 50%10
19189 Bailey St
Marion, IL 62959
(618) 982-2181
Marion, IL 62959
(618) 982-2181
Gr: 9-12 | 154 students Student-teacher ratio: 13:1 Minority enrollment: 4%
Rank: n/an/a
Roe 21 Senior's Plus Alop
Alternative School
502 W Jackson St
Marion, IL 62959
(618) 998-1283
Marion, IL 62959
(618) 998-1283
Gr: 10-12
Rank: n/an/a
Starquest Academy Rssp South
Alternative School
502 W Jackson St
Marion, IL 62959
(618) 998-1283
Marion, IL 62959
(618) 998-1283
Gr: 6-12
Frequently Asked Questions
What are the top-ranked public high schools in Williamson County, IL?
The top-ranked public high schools in Williamson County, IL include Carterville High School, Herrin High School and Project Echo.
How many public high schools are located in Williamson County?
6 public high schools are located in Williamson County.
What is the racial composition of students in Williamson County?
Williamson County public high schools minority enrollment is 19% of the student body (majority Black and Hispanic), which is less than the Illinois public high schools average of 55% (majority Hispanic).
Which public high schools in Williamson County are often viewed compared to one another?
Popular comparisons of public high schools in Williamson County include: Herrin High School vs. Carterville High School, Carterville High School vs. Herrin High School, Marion High School vs. Johnston City High School
Recent Articles
AI Report Cards: Should Schools Evaluate AI Use?
Explore whether schools should assess student AI use, the benefits, risks, and what responsible AI report cards could look like in 2026.
The Parent’s Guide to School Cell Phone Bans in 2026
Learn how school cell phone bans work in 2026, why districts are adopting them, and what parents should expect.
Parental Involvement in Public Schools: 2026 Update
Explore the latest 2026 trends, research, and strategies shaping parental involvement in public schools and student success.