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For the 2026 school year, there are 11 private schools serving 1,850 students in Jefferson County, MO (there are , serving 34,841 public students). 5% of all K-12 students in Jefferson County, MO are educated in private schools (compared to the MO state average of 12%).

The top-ranked private schools in Jefferson County, MO include St. Pius X High School, Twin City Christian Academy, and St. John's Lutheran School.

The average acceptance rate is 87%, which is higher than the Missouri private school average acceptance rate of 86%.

91% of private schools in Jefferson County, MO are religiously affiliated (most commonly Catholic and Christian).