| Index | St. Clair | Missouri | National |
| Average Test Scores | 42% | 44% | 48% |
| Student/Teacher ratio | 17:1 | 14:1 | 16:1 |
| Total public schools | 5 | 1,899 | 79,221 |
| Total private schools | 1 | 531 | 24,874 |
| Total post-secondary schools | n/a | 213 | 7,963 |
| Index | St. Clair | Missouri | National |
| Completed 8th grade | 77.0% | 86.0% | 84.3% |
| Completed high school | 73.5% | 84.2% | 83.0% |
| Completed some college | 43.1% | 57.7% | 59.4% |
| Completed associate degree | 17.6% | 35.2% | 38.5% |
| Completed bachelors | 10.8% | 27.6% | 30.3% |
| Completed masters | 2.9% | 10.4% | 11.5% |
| Completed professional degree | 0.0% | 2.8% | 3.3% |
| Completed doctorate | 0.0% | 1.2% | 1.3% |
There are a total of 5 public schools, 1 private schools and n/a post-secondary schools in St. Clair. Using the proficiency score averages, the average test scores for St. Clair, MO schools is 42%. The average student to teacher ratio is 17:1. In St. Clair, MO, an average of 77.0% of students have completed 8th grade and an average of 73.5% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Sullivan, MO | 6,499 | 63% | 31.7% |
| Union, MO | 11,931 | 49% | 3.0% |
| Washington, MO | 14,052 | 49% | 1.0% |
| Villa Ridge, MO | 3,179 | 48% | = 100 |
| Pacific, MO | 6,780 | 45% | 6.0% |
| St. Clair, MO | 4,702 | 42% | 12.2% |
| City | Population | Avg. Test Scores | National Avg. |
| Christiana, TN | 4,701 | 46% | 3.6% |
| Hyde Park, UT | 4,703 | 66% | 36.5% |
| Black Diamond, WA | 4,703 | 66% | 37.5% |
| Auburn, IL | 4,701 | 29% | 39.6% |
| Baxley, GA | 4,703 | 39% | 18.0% |
| St. Clair, MO | 4,702 | 42% | 12.2% |
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