| Index | St. John | Missouri | National |
| Average Test Scores | 29% | 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 | St. John | Missouri | National |
| Completed 8th grade | 79.8% | 86.0% | 84.3% |
| Completed high school | 78.1% | 84.2% | 83.0% |
| Completed some college | 45.1% | 57.7% | 59.4% |
| Completed associate degree | 16.8% | 35.2% | 38.5% |
| Completed bachelors | 12.2% | 27.6% | 30.3% |
| Completed masters | 5.2% | 10.4% | 11.5% |
| Completed professional degree | 0.9% | 2.8% | 3.3% |
| Completed doctorate | 0.1% | 1.2% | 1.3% |
There are a total of n/a public schools, n/a private schools and n/a post-secondary schools in St. John. Using the proficiency score averages, the average test scores for St. John, MO schools is 29%. The average student to teacher ratio is n/a. In St. John, MO, an average of 79.8% of students have completed 8th grade and an average of 78.1% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Clayton, MO | 16,763 | 73% | 52.7% |
| Brentwood, MO | 7,986 | 70% | 45.6% |
| Olivette, MO | 7,837 | 70% | 44.8% |
| Chesterfield, MO | 47,603 | 69% | 43.2% |
| Kirkwood, MO | 27,772 | 69% | 43.1% |
| St. John, MO | 6,369 | 29% | 40.6% |
| City | Population | Avg. Test Scores | National Avg. |
| Douglas, WY | 6,369 | 58% | 20.0% |
| Clover, SC | 6,370 | 64% | 32.3% |
| Air Force Academy, CO | 6,368 | 59% | 22.9% |
| Iowa Park, TX | 6,370 | 56% | 17.4% |
| Fowler, CA | 6,366 | 46% | 4.9% |
| St. John, MO | 6,369 | 29% | 40.6% |
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