| 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 |

| 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 | 13,697 | 42% | 11.6% |
| New Berlin, IL | 1,376 | 39% | 19.4% |
| Rochester, IL | 3,914 | 36% | 24.7% |
| Divernon, IL | 1,229 | 36% | 25.0% |
| Virden, IL | 3,571 | 35% | 28.1% |
| Thayer, IL | 635 | n/a |
| City | Population | Avg. Test Scores | National Avg. |
| Pinehurst, GA | 635 | 16% | 66.1% |
| Big Water, UT | 635 | 40% | 16.7% |
| Parishville, NY | 635 | 58% | 21.4% |
| St. John, WA | 635 | 60% | 25.0% |
| La Crosse, VA | 634 | 80% | 65.6% |
| Thayer, IL | 635 | n/a |