| Index | Lake St. Louis | Missouri | National |
| Average Test Scores | 71% | 44% | 48% |
| 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 | Population | Avg. Test Scores | National Avg. |
| Dardenne Prairie, MO | 13,385 | 73% | 51.0% |
| Weldon Spring, MO | 5,536 | 70% | 45.5% |
| Chesterfield, MO | 47,603 | 69% | 43.2% |
| Cottleville, MO | 5,439 | 69% | 43.1% |
| St. Peters, MO | 57,536 | 63% | 31.5% |
| Lake St. Louis, MO | 16,357 | 71% | 48.4% |
| City | Population | Avg. Test Scores | National Avg. |
| Heber, UT | 16,362 | 43% | 10.9% |
| Adelphi, MD | 16,364 | 19% | 59.6% |
| Red Wing, MN | 16,366 | 49% | 2.6% |
| Cañon City, CO | 16,369 | 34% | 29.3% |
| Dyersburg, TN | 16,371 | 50% | 3.6% |
| Lake St. Louis, MO | 16,357 | 71% | 48.4% |
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