| Index | St. Elmo | Illinois | National |
| Average Test Scores | 29% | 33% | 48% |
| Student/Teacher ratio | 12:1 | 18:1 | 16:1 |
| Total public schools | 3 | 3,938 | 79,221 |
| Total private schools | n/a | 1,438 | 24,874 |
| Total post-secondary schools | n/a | 306 | 7,963 |
| Index | St. Elmo | Illinois | National |
| Completed 8th grade | 82.1% | 86.2% | 84.3% |
| Completed high school | 77.7% | 84.7% | 83.0% |
| Completed some college | 45.6% | 61.8% | 59.4% |
| Completed associate degree | 19.3% | 40.7% | 38.5% |
| Completed bachelors | 9.8% | 32.9% | 30.3% |
| Completed masters | 5.1% | 12.7% | 11.5% |
| Completed professional degree | 0.6% | 3.4% | 3.3% |
| Completed doctorate | 0.0% | 1.2% | 1.3% |
There are a total of 3 public schools, n/a private schools and n/a post-secondary schools in St. Elmo. Using the proficiency score averages, the average test scores for St. Elmo, IL schools is 29%. The average student to teacher ratio is 12:1. In St. Elmo, IL, an average of 82.1% of students have completed 8th grade and an average of 77.7% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Beecher City, IL | 373 | 46% | 4.7% |
| Ramsey, IL | 871 | 36% | 25.5% |
| Herrick, IL | 367 | 32% | 33.3% |
| Brownstown, IL | 839 | 29% | 39.6% |
| Vandalia, IL | 6,615 | 27% | 44.4% |
| St. Elmo, IL | 1,466 | 29% | 39.9% |
| City | Population | Avg. Test Scores | National Avg. |
| Averill Park, NY | 1,466 | 74% | 53.8% |
| Ravenna, NE | 1,465 | 58% | 21.4% |
| Collinsville, MS | 1,467 | 52% | 7.3% |
| Lake Don Pedro, CA | 1,465 | 42% | 12.5% |
| Helena, OK | 1,467 | 50% | 4.2% |
| St. Elmo, IL | 1,466 | 29% | 39.9% |
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