O Fallon High School
🇺🇸 Official data · 2025O Fallon, Illinois 62269 · O Fallon Twp HSD 203
#64 of 691 high schools in Illinois
#5538 of 16,910 nationally
About O Fallon High School
O Fallon High School is a public high located in O Fallon, in the O Fallon Twp HSD 203 school district of Illinois, United States. It caters for Grades 9–12. In 2025 it enrolled 2,540 students. Traditional public schools run by a school district; free to attend.
Its Success Index (US) is 61.1 out of 100, placing it in the top 50% of high schools in United States and 64th of 691 ranked high schools in Illinois. Its strongest component is community advantage (fewer free/reduced-price lunch) (83th percentile), and its weakest is students per teacher (38th percentile).
Other published figures: enrollment 2,540.
There are 10 schools in O Fallon; O Fallon High School ranks 5th of 10 scored schools there.
Success Index (US) breakdown
Each component is a percentile against high schools across United States.
- Math proficiency (30%)53%
- Reading proficiency (30%)52%
- Community advantage (fewer free/reduced-price lunch) (25%)28.1%
- Students per teacher (15%)16.4
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 O Fallon High School by the official sources.
- Enrollment
- 2,540
- Students enrolled in the latest NCES directory year.
- Free/reduced-price lunch
- 28.1%
- Share of students eligible for free or reduced-price lunch.
- Students per teacher
- 16.4
- Enrollment divided by FTE teachers; not class size.
- Reading proficiency
- 52%
- Share of tested students proficient or above (all students, all grades).
- Math proficiency
- 53%
- Share of tested students proficient or above (all students, all grades).
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Schools near O Fallon High School
Closest schools by straight-line distance, with their Success Index (US).
Laverna Evans Elem School
O Fallon · Public elementary · Grades PK–5
421 students · 967 m away
Marie Schaefer Elem School
O Fallon · Public elementary · Grades PK–5
598 students · 1.1 km away
Estelle Kampmeyer Elem School
O Fallon · Public elementary · Grades PK–5
465 students · 1.2 km away
Amelia V Carriel Jr High
O Fallon · Public middle · Grades 6–8
664 students · 2.1 km away
J Emmett Hinchcliffe Sr Elem Sch
O Fallon · Public elementary · Grades PK–5
452 students · 2.3 km away
Shiloh Middle School
Shiloh · Public middle · Grades 4–8
331 students · 2.7 km away
Shiloh Elementary School
Shiloh · Public elementary · Grades PK–3
245 students · 3.4 km away
Fulton Jr High School
O Fallon · Public middle · Grades 6–8
667 students · 3.8 km away
Dawn Elser Elementary School
O Fallon · Public elementary · Grades PK–3
330 students · 4.0 km away
Delores Moye Elem School
O Fallon · Public elementary · Grades PK–5
595 students · 4.3 km away
Similar schools
Public high schools in Illinois with a comparable Enrollment.
Palatine High School
Palatine · Public high · Grades 9–12
2,535 students
Lake Park High School
Roselle · Public high · Grades 9–12
2,522 students
Amos Alonzo Stagg High School
Palos Hills · Public high · Grades 9–12
2,560 students
Dundee-Crown High School
Carpentersville · Public high · Grades 9–12
2,573 students
Elgin High School
Elgin · Public high · Grades 9–12
2,576 students
Maine South High School
Park Ridge · Public high · Grades 9–12
2,494 students
Frequently asked questions
Is O Fallon High School a good school?
O Fallon High School has a Success Index (US) of 61.1 out of 100 (Top 50% of high schools in United States) and ranks #64 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 O Fallon High School rank in Illinois?
O Fallon High School ranks #64 of 691 high schools in Illinois and #5538 of 16,910 nationally on the Success Index (US) (2025 data).
How many students attend O Fallon High School?
O Fallon High School had 2,540 students in 2025.
Is O Fallon High School a elementary school or a high school?
O Fallon High School is classified as a high covering Grades 9–12. It is a public school.
What other schools are near O Fallon High School?
There are 10 schools within 15 km of O Fallon High School; they are listed on this page with their Success Index (US) and distance, and can be compared side by side.