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For the 2026 school year, there is 1 public high school serving 2,559 students in O Fallon, IL.

The top-ranked public high school in O Fallon, IL is O Fallon High School. Overall testing rank is based on a school's combined math and reading proficiency test score ranking.

O Fallon, IL public high school have an average math proficiency score of 36% (versus the Illinois public high school average of 26%), and reading proficiency score of 42% (versus the 29% statewide average). High schools in O Fallon have an average ranking of 9/10, which is in the top 20% of Illinois public high schools.

O Fallon, IL public high school have a Graduation Rate of 94%, which is more than the Illinois average of 87%.

The school with highest graduation rate is O Fallon High School, with 94% graduation rate. Read more about public school graduation rate statistics in Illinois or national school graduation rate statistics.

Minority enrollment is 41% of the student body (majority Black), which is less than the Illinois public high school average of 55% (majority Hispanic).