| Index | St. Johns | Illinois | National |
| Average Test Scores | n/a | 33% | 48% |
| Student/Teacher ratio | n/a | 18:1 | 16:1 |
| Total public schools | n/a | 3,938 | 79,221 |
| Total private schools | n/a | 1,438 | 24,874 |
| Total post-secondary schools | n/a | 306 | 7,963 |
| Index | St. Johns | Illinois | National |
| Completed 8th grade | 73.9% | 86.2% | 84.3% |
| Completed high school | 72.0% | 84.7% | 83.0% |
| Completed some college | 44.1% | 61.8% | 59.4% |
| Completed associate degree | 29.2% | 40.7% | 38.5% |
| Completed bachelors | 9.3% | 32.9% | 30.3% |
| Completed masters | 1.9% | 12.7% | 11.5% |
| Completed professional degree | 1.2% | 3.4% | 3.3% |
| Completed doctorate | 0.0% | 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. Johns. Using the proficiency score averages, the average test scores for St. Johns, IL schools is n/a. The average student to teacher ratio is n/a. In St. Johns, IL, an average of 73.9% of students have completed 8th grade and an average of 72.0% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Tamaroa, IL | 740 | 40% | 17.7% |
| Vergennes, IL | 238 | 37% | 22.9% |
| Pinckneyville, IL | 5,391 | 36% | 25.3% |
| Waltonville, IL | 413 | 32% | 32.8% |
| Du Quoin, IL | 5,723 | 32% | 33.3% |
| St. Johns, IL | 160 | n/a |
| City | Population | Avg. Test Scores | National Avg. |
| Tomales, CA | 160 | 36% | 25.0% |
| Jordan Valley, OR | 160 | 53% | 9.4% |
| Fort Smith, MT | 160 | 30% | 37.5% |
| Mount Eaton, OH | 160 | 72% | 50.0% |
| De Smet, ID | 160 | 10% | 79.2% |
| St. Johns, IL | 160 | n/a |
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