| Index | Seneca | Illinois | National |
| Average Test Scores | 40% | 33% | 48% |
| Student/Teacher ratio | 23:1 | 18:1 | 16:1 |
| Total public schools | 4 | 3,938 | 79,221 |
| Total private schools | n/a | 1,438 | 24,874 |
| Total post-secondary schools | n/a | 306 | 7,963 |
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| Index | Seneca | Illinois | National |
| Completed 8th grade | 89.8% | 86.2% | 84.3% |
| Completed high school | 89.5% | 84.7% | 83.0% |
| Completed some college | 51.4% | 61.8% | 59.4% |
| Completed associate degree | 25.9% | 40.7% | 38.5% |
| Completed bachelors | 15.5% | 32.9% | 30.3% |
| Completed masters | 5.5% | 12.7% | 11.5% |
| Completed professional degree | 0.6% | 3.4% | 3.3% |
| Completed doctorate | 0.4% | 1.2% | 1.3% |
There are a total of 4 public schools, n/a private schools and n/a post-secondary schools in Seneca. Using the proficiency score averages, the average test scores for Seneca, IL schools is 40%. The average student to teacher ratio is 23:1. In Seneca, IL, an average of 89.8% of students have completed 8th grade and an average of 89.5% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Grand Ridge, IL | 670 | 50% | 3.1% |
| Morris, IL | 14,819 | 42% | 12.5% |
| Mazon, IL | 1,253 | 40% | 17.2% |
| Dwight, IL | 3,954 | 37% | 22.9% |
| Ottawa, IL | 19,177 | 33% | 32.3% |
| Seneca, IL | 2,603 | 40% | 17.4% |
| City | Population | Avg. Test Scores | National Avg. |
| Elwood, IL | 2,603 | 51% | 5.2% |
| Dennison, OH | 2,604 | 76% | 57.3% |
| Lyford, TX | 2,604 | 43% | 9.7% |
| Pima, AZ | 2,602 | 42% | 13.4% |
| New Lisbon, WI | 2,602 | 26% | 46.4% |
| Seneca, IL | 2,603 | 40% | 17.4% |
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