| Index | Williamson | Illinois | National |
| Average Test Scores | n/a | 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 | Williamson | Illinois | National |
| Completed 8th grade | 76.4% | 86.2% | 84.3% |
| Completed high school | 75.8% | 84.7% | 83.0% |
| Completed some college | 27.4% | 61.8% | 59.4% |
| Completed associate degree | 15.3% | 40.7% | 38.5% |
| Completed bachelors | 3.8% | 32.9% | 30.3% |
| Completed masters | 0.0% | 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 Williamson. Using the proficiency score averages, the average test scores for Williamson, IL schools is n/a. The average student to teacher ratio is n/a. In Williamson, IL, an average of 76.4% of students have completed 8th grade and an average of 75.8% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Worden, IL | 875 | 57% | 18.8% |
| Alhambra, IL | 676 | 55% | 14.6% |
| Marine, IL | 994 | 55% | 13.5% |
| Edwardsville, IL | 25,332 | 53% | 9.5% |
| Pocahontas, IL | 797 | 47% | 2.1% |
| Williamson, IL | 202 | n/a |
| City | Population | Avg. Test Scores | National Avg. |
| Cheraw, CO | 202 | 30% | 38.5% |
| Welch, TX | 202 | 25% | 49.0% |
| Pembine, WI | 203 | 43% | 11.5% |
| Downsville, WI | 201 | 25% | 47.9% |
| Garden Grove, IA | 203 | 70% | 45.8% |
| Williamson, IL | 202 | n/a |
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