| 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 | 385 | 46% | 4.7% |
| Ramsey, IL | 896 | 36% | 25.5% |
| Herrick, IL | 381 | 32% | 33.3% |
| Brownstown, IL | 871 | 29% | 39.6% |
| Vandalia, IL | 6,854 | 27% | 44.4% |
| St. Elmo, IL | 1,505 | 29% | 39.9% |
| City | Population | Avg. Test Scores | National Avg. |
| Lake Don Pedro, CA | 1,505 | 42% | 12.5% |
| Urania, LA | 1,505 | 85% | 76.0% |
| Belle Plaine, KS | 1,505 | 22% | 55.2% |
| Clarkson, KY | 1,505 | 55% | 13.5% |
| Crownsville, MD | 1,506 | 65% | 34.4% |
| St. Elmo, IL | 1,505 | 29% | 39.9% |