| Index | Festus | Missouri | National |
| Average Test Scores | 59% | 44% | 48% |
| Student/Teacher ratio | 16:1 | 14:1 | 16:1 |
| Total public schools | 7 | 1,899 | 79,221 |
| Total private schools | 4 | 531 | 24,874 |
| Total post-secondary schools | n/a | 213 | 7,963 |
| Index | Festus | Missouri | National |
| Completed 8th grade | 81.6% | 86.0% | 84.3% |
| Completed high school | 79.9% | 84.2% | 83.0% |
| Completed some college | 52.4% | 57.7% | 59.4% |
| Completed associate degree | 27.8% | 35.2% | 38.5% |
| Completed bachelors | 16.6% | 27.6% | 30.3% |
| Completed masters | 6.6% | 10.4% | 11.5% |
| Completed professional degree | 0.4% | 2.8% | 3.3% |
| Completed doctorate | 0.1% | 1.2% | 1.3% |
There are a total of 7 public schools, 4 private schools and n/a post-secondary schools in Festus. Using the proficiency score averages, the average test scores for Festus, MO schools is 59%. The average student to teacher ratio is 16:1. In Festus, MO, an average of 81.6% of students have completed 8th grade and an average of 79.9% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Waterloo, IL | 10,417 | 59% | 22.4% |
| Bloomsdale, MO | 828 | 57% | 18.8% |
| Herculaneum, MO | 4,081 | 56% | 16.7% |
| Cedar Hill, MO | 1,625 | 53% | 10.4% |
| Imperial, MO | 4,947 | 51% | 6.6% |
| Festus, MO | 12,054 | 59% | 23.1% |
| City | Population | Avg. Test Scores | National Avg. |
| Londonderry, NH | 12,053 | 58% | 21.0% |
| Scotts Valley, CA | 12,055 | 67% | 39.2% |
| Enumclaw, WA | 12,062 | 61% | 27.1% |
| Brookhaven, MS | 12,045 | 39% | 19.2% |
| Red Bank, NJ | 12,039 | 53% | 10.8% |
| Festus, MO | 12,054 | 59% | 23.1% |
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