The O'Fallon, IL educational system consists of n/a public schools, 3 private schools and n/a post-secondary schools. O'Fallon public schools have average test scores of 41% which is 30% higher than than the Illinois average and 17% lower than than the national average. The student to teach ratio of O'Fallon public schools is n/a, compared to 18:1 in Illinois and 16:1 across all of the United States. A total of 95.3% of students have completed 8th grade, 95.0% have completed high school, 46.1% have completed a bachelor’s degree and 3.7% have completed a doctorate degree.