| Index | St. Clair | Pennsylvania | National |
| Average Test Scores | 52% | 55% | 48% |
| Student/Teacher ratio | 17:1 | 16:1 | 16:1 |
| Total public schools | 1 | 2,563 | 79,221 |
| Total private schools | n/a | 1,626 | 24,874 |
| Total post-secondary schools | n/a | 406 | 7,963 |
| Index | St. Clair | Pennsylvania | National |
| Completed 8th grade | 84.5% | 86.9% | 84.3% |
| Completed high school | 84.5% | 85.6% | 83.0% |
| Completed some college | 36.7% | 53.6% | 59.4% |
| Completed associate degree | 18.5% | 37.4% | 38.5% |
| Completed bachelors | 8.7% | 29.3% | 30.3% |
| Completed masters | 3.0% | 11.5% | 11.5% |
| Completed professional degree | 1.2% | 3.3% | 3.3% |
| Completed doctorate | 0.0% | 1.4% | 1.3% |
There are a total of 1 public schools, n/a private schools and n/a post-secondary schools in St. Clair. Using the proficiency score averages, the average test scores for St. Clair, PA schools is 52%. The average student to teacher ratio is 17:1. In St. Clair, PA, an average of 84.5% of students have completed 8th grade and an average of 84.5% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Friedensburg, PA | 889 | 82% | 70.8% |
| Cressona, PA | 1,350 | 67% | 39.6% |
| Pine Grove, PA | 2,088 | 61% | 26.4% |
| Schuylkill Haven, PA | 5,137 | 59% | 22.1% |
| Orwigsburg, PA | 2,964 | 58% | 20.3% |
| St. Clair, PA | 2,842 | 52% | 8.3% |
| City | Population | Avg. Test Scores | National Avg. |
| Somerset, WI | 2,842 | 44% | 8.7% |
| Ferris, TX | 2,842 | 35% | 27.3% |
| Ketchum, ID | 2,843 | 61% | 27.1% |
| Cache, OK | 2,843 | 36% | 24.5% |
| Woodbury, TN | 2,841 | 25% | 47.9% |
| St. Clair, PA | 2,842 | 52% | 8.3% |
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