| Index | Lake St. Louis | Missouri | National |
| Average Test Scores | 71% | 51% | 49% |
| Student/Teacher ratio | n/a | 14:1 | 16:1 |
| Total public schools | n/a | 1,899 | 79,221 |
| Total private schools | n/a | 531 | 24,874 |
| Total post-secondary schools | n/a | 213 | 7,963 |
| Index | Lake St. Louis | Missouri | National |
| Completed 8th grade | 94.7% | 86.0% | 84.3% |
| Completed high school | 94.7% | 84.2% | 83.0% |
| Completed some college | 75.2% | 57.7% | 59.4% |
| Completed associate degree | 50.3% | 35.2% | 38.5% |
| Completed bachelors | 40.2% | 27.6% | 30.3% |
| Completed masters | 14.6% | 10.4% | 11.5% |
| Completed professional degree | 2.4% | 2.8% | 3.3% |
| Completed doctorate | 1.5% | 1.2% | 1.3% |
There are a total of n/a public schools, n/a private schools and n/a post-secondary schools in Lake St. Louis. Using the proficiency score averages, the average test scores for Lake St. Louis, MO schools is 71%. The average student to teacher ratio is n/a. In Lake St. Louis, MO, an average of 94.7% of students have completed 8th grade and an average of 94.7% have completed high school.
| City, State | Population | Avg. Test Scores | National Avg. |
| Chesterfield, MO | 47,717 | 78% | 59% |
| Clarkson Valley, MO | 2,638 | 75% | 53% |
| Wildwood, MO | 35,764 | 74% | 49% |
| Ballwin, MO | 30,431 | 73% | 47% |
| Ellisville, MO | 9,188 | 73% | 47% |
| Lake St. Louis, MO | 15,150 | 71% | 44% |
| City, State | Population | Avg. Test Scores | National Avg. |
| River Falls, WI | 15,152 | 59% | 20% |
| Winder, GA | 15,148 | 37% | 25% |
| Cullman, AL | 15,156 | 58% | 18% |
| North Fair Oaks, CA | 15,144 | 23% | 53% |
| Gloversville, NY | 15,158 | 29% | 40% |
| Lake St. Louis, MO | 15,150 | 71% | 44% |
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