A−
O Fallon High School
PublicHighGrades 9–12
600 S Smiley St, O Fallon, IL 62269 · (618) 632-3507 · Part of O'Fallon Township High School District 203
Students
2,540
Students per teacher
16:1
Free or reduced lunch
28%
Setting
Suburb
Grades
9–12
What stands out about O Fallon High School
- School Grade A−: near the top of Illinois’s public schools
- Math proficiency 6 pts above the state
- Reading / language arts 9 pts above the state
Test scores
EDFacts via Urban Institute Education Data Portal (SY2020-21) · 2020–21Math proficiency32%
State average 25.9%
Reading / language arts40%
State average 30.7%
Location
Directions ↗
600 S Smiley St, O Fallon
Students
Enrollment by grade
Grade 9619
Grade 10662
Grade 11630
Grade 12629
Enrollment over time
2,511’20
2,533’21
2,521’22
2,559’23
2,540’24
About steady.
Who goes here
White 59%Black 20%Two or more races 9%Hispanic 8%Asian 2%American Indian/Alaska Native <1%Native Hawaiian/Pacific Islander <1%
As reported to NCES, share of students with a reported race or ethnicity.
What neighbors say
No ratings yet. Be the first neighbor to rate it.
Parents talk
Conversations in Town Square that mention O Fallon High School.
School facts: U.S. Department of Education (NCES), 2024-2025 school year. Scores: EDFacts via Urban Institute Education Data Portal (SY2020-21). The School Grade is our own summary of state test results. Neighbor ratings are opinions, not an official measure of school quality.