| Index | Thayer | 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 |
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| Index | Thayer | Illinois | National |
| Completed 8th grade | 90.4% | 86.2% | 84.3% |
| Completed high school | 90.1% | 84.7% | 83.0% |
| Completed some college | 57.5% | 61.8% | 59.4% |
| Completed associate degree | 22.5% | 40.7% | 38.5% |
| Completed bachelors | 13.7% | 32.9% | 30.3% |
| Completed masters | 2.2% | 12.7% | 11.5% |
| Completed professional degree | 0.6% | 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 Thayer. Using the proficiency score averages, the average test scores for Thayer, IL schools is n/a. The average student to teacher ratio is n/a. In Thayer, IL, an average of 90.4% of students have completed 8th grade and an average of 90.1% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Chatham, IL | 13,231 | 42% | 11.6% |
| New Berlin, IL | 1,324 | 39% | 19.4% |
| Rochester, IL | 3,778 | 36% | 24.7% |
| Divernon, IL | 1,194 | 36% | 25.0% |
| Virden, IL | 3,444 | 35% | 28.1% |
| Thayer, IL | 622 | n/a |
| City | Population | Avg. Test Scores | National Avg. |
| McKenna, WA | 623 | 61% | 27.1% |
| Arnett, OK | 623 | 46% | 4.2% |
| Parishville, NY | 623 | 58% | 21.4% |
| Solomon, AZ | 623 | 50% | 3.1% |
| Smiley, TX | 621 | 32% | 33.3% |
| Thayer, IL | 622 | n/a |
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