| Index | St. Joseph | Illinois | National |
| Average Test Scores | 52% | 33% | 48% |
| Student/Teacher ratio | 23:1 | 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. Joseph | Illinois | National |
| Completed 8th grade | 98.3% | 86.2% | 84.3% |
| Completed high school | 98.3% | 84.7% | 83.0% |
| Completed some college | 76.3% | 61.8% | 59.4% |
| Completed associate degree | 49.0% | 40.7% | 38.5% |
| Completed bachelors | 34.5% | 32.9% | 30.3% |
| Completed masters | 17.3% | 12.7% | 11.5% |
| Completed professional degree | 3.2% | 3.4% | 3.3% |
| Completed doctorate | 1.1% | 1.2% | 1.3% |
There are a total of 3 public schools, n/a private schools and n/a post-secondary schools in St. Joseph. Using the proficiency score averages, the average test scores for St. Joseph, IL schools is 52%. The average student to teacher ratio is 23:1. In St. Joseph, IL, an average of 98.3% of students have completed 8th grade and an average of 98.3% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Royal, IL | 370 | 65% | 35.4% |
| Savoy, IL | 8,802 | 55% | 14.6% |
| Philo, IL | 1,398 | 50% | 3.1% |
| Thomasboro, IL | 1,036 | 44% | 9.4% |
| Ogden, IL | 773 | 42% | 12.5% |
| St. Joseph, IL | 4,053 | 52% | 7.6% |
| City | Population | Avg. Test Scores | National Avg. |
| St. James, MO | 4,053 | 45% | 7.3% |
| Cannon Falls, MN | 4,053 | 62% | 28.6% |
| Mount Olive, AL | 4,052 | 57% | 18.8% |
| Garden Ridge, TX | 4,054 | 66% | 36.5% |
| Singac, NJ | 4,054 | 82% | 70.8% |
| St. Joseph, IL | 4,053 | 52% | 7.6% |
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