| Index | Williamsville | Illinois | National |
| Average Test Scores | 45% | 33% | 48% |
| Student/Teacher ratio | 17:1 | 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 | Williamsville | Illinois | National |
| Completed 8th grade | 97.7% | 86.2% | 84.3% |
| Completed high school | 97.2% | 84.7% | 83.0% |
| Completed some college | 77.5% | 61.8% | 59.4% |
| Completed associate degree | 44.6% | 40.7% | 38.5% |
| Completed bachelors | 33.7% | 32.9% | 30.3% |
| Completed masters | 13.2% | 12.7% | 11.5% |
| Completed professional degree | 5.5% | 3.4% | 3.3% |
| Completed doctorate | 0.7% | 1.2% | 1.3% |
There are a total of 3 public schools, n/a private schools and n/a post-secondary schools in Williamsville. Using the proficiency score averages, the average test scores for Williamsville, IL schools is 45%. The average student to teacher ratio is 17:1. In Williamsville, IL, an average of 97.7% of students have completed 8th grade and an average of 97.2% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Sherman, IL | 4,470 | 67% | 38.5% |
| Cantrall, IL | 104 | 45% | 6.3% |
| Lincoln, IL | 13,742 | 42% | 12.4% |
| Athens, IL | 2,349 | 37% | 22.9% |
| Rochester, IL | 3,778 | 36% | 24.7% |
| Williamsville, IL | 1,468 | 45% | 6.3% |
| City | Population | Avg. Test Scores | National Avg. |
| Menard, TX | 1,468 | 42% | 12.0% |
| Stratford, OK | 1,468 | 36% | 24.3% |
| Clarkson, KY | 1,468 | 55% | 13.5% |
| Leavittsburg, OH | 1,468 | 67% | 39.9% |
| Niagara, WI | 1,468 | 35% | 28.1% |
| Williamsville, IL | 1,468 | 45% | 6.3% |
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