| Index | Mendon | Illinois | National |
| Average Test Scores | 23% | 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 | Mendon | Illinois | National |
| Completed 8th grade | 88.0% | 86.2% | 84.3% |
| Completed high school | 87.1% | 84.7% | 83.0% |
| Completed some college | 44.7% | 61.8% | 59.4% |
| Completed associate degree | 25.3% | 40.7% | 38.5% |
| Completed bachelors | 18.0% | 32.9% | 30.3% |
| Completed masters | 4.2% | 12.7% | 11.5% |
| Completed professional degree | 0.0% | 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 Mendon. Using the proficiency score averages, the average test scores for Mendon, IL schools is 23%. The average student to teacher ratio is n/a. In Mendon, IL, an average of 88.0% of students have completed 8th grade and an average of 87.1% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Liberty, IL | 398 | 41% | 15.1% |
| Bowen, IL | 583 | 40% | 17.7% |
| Canton, MO | 2,455 | 40% | 17.7% |
| Camp Point, IL | 1,144 | 31% | 36.5% |
| Quincy, IL | 40,111 | 28% | 41.8% |
| Mendon, IL | 1,092 | 23% | 52.8% |
| City | Population | Avg. Test Scores | National Avg. |
| Joseph, OR | 1,092 | 60% | 24.0% |
| Jamestown, IN | 1,092 | 64% | 32.3% |
| Gales Ferry, CT | 1,093 | 52% | 7.3% |
| Bronson, FL | 1,093 | 46% | 4.7% |
| Red Cloud, NE | 1,091 | 45% | 6.8% |
| Mendon, IL | 1,092 | 23% | 52.8% |
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