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For the 2025-26 school year, there are 4 public schools serving 3,531 students in Lake Saint Louis, MO (there are , serving 7 private students). 100% of all K-12 students in Lake Saint Louis, MO are educated in public schools (compared to the MO state average of 88%).

The top-ranked public schools in Lake Saint Louis, MO are Liberty High School, Discovery Ridge Elementary School and Green Tree Elementary School. Overall testing rank is based on a school's combined math and reading proficiency test score ranking.

Lake Saint Louis, MO public schools have an average math proficiency score of 59% (versus the Missouri public school average of 40%), and reading proficiency score of 60% (versus the 43% statewide average). Schools in Lake Saint Louis have an average ranking of 10/10, which is in the top 5% of Missouri public schools.

Minority enrollment is 22% of the student body (majority Black and Hispanic), which is less than the Missouri public school average of 32% (majority Black).