Lebanon High School
Public · Grades 6–12 · 218 students
O Fallon High School
600 S Smiley St, O Fallon, IL 62269
Grades
9–12
High
Students
2,540
Enrolled 2024–25
Students per teacher
16.3 : 1
Full-time teachers
District
O Fallon Twp HSD 203
St. Clair County
Schola Grade A · Excellent
Letter grade (A–F) · compared with 684 Illinois high schools · How we grade
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 O Fallon High School
O Fallon High School is a public high school in O Fallon, Illinois, serving grades 9–12. It is part of O Fallon Twp HSD 203. The school is located in a large suburb in St. Clair County.
In the 2024–25 school year, 2,540 students were enrolled, with about 16.3 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
School details
- Type
- Public School · What this means
- Level
- High
- Grades offered
- 9–12
- Enrollment (2024–25)
- 2,540 students
- Students per teacher
- 16.3 to 1
- AP courses offered
- 14
- Charter school
- No
- Magnet school
- No
- Locale
- Suburb — Large
- School district
- O Fallon Twp HSD 203
- County
- St. Clair County
- NCES school ID
- 172979003090
Schools near O Fallon High School
All 12 schools in O Fallon →
Belleville High School-East
Public · Grades 9–12 · 2,600 students
Collinsville High School
Public · Grades 9–12 · 1,956 students
Saint Clair Co ROE Safe School
Alternative · Grades 5–12
Collinsville Area Career Ctr
CTE · Grades 11–12
Althoff Catholic High School
Private · Grades 9–12 · 335 students
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.