| Index | Garrett | 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 | Garrett | Illinois | National |
| Completed 8th grade | 80.6% | 86.2% | 84.3% |
| Completed high school | 77.6% | 84.7% | 83.0% |
| Completed some college | 35.8% | 61.8% | 59.4% |
| Completed associate degree | 4.5% | 40.7% | 38.5% |
| Completed bachelors | 1.5% | 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 Garrett. Using the proficiency score averages, the average test scores for Garrett, IL schools is n/a. The average student to teacher ratio is n/a. In Garrett, IL, an average of 80.6% of students have completed 8th grade and an average of 77.6% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Philo, IL | 1,398 | 50% | 3.1% |
| Bement, IL | 1,490 | 39% | 18.8% |
| Tolono, IL | 3,071 | 34% | 29.5% |
| Tuscola, IL | 4,599 | 32% | 32.6% |
| Atwood, IL | 1,126 | 30% | 38.5% |
| Garrett, IL | 118 | n/a |
| City | Population | Avg. Test Scores | National Avg. |
| Arthur, NE | 118 | 53% | 9.4% |
| Montgomery Creek, CA | 118 | 30% | 37.5% |
| Centerville, WA | 118 | 65% | 35.4% |
| Chalkyitsik, AK | 118 | 50% | 4.2% |
| Friendsville, PA | 118 | 62% | 29.2% |
| Garrett, IL | 118 | n/a |
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