| Index | Grand Detour | 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 | Grand Detour | Illinois | National |
| Completed 8th grade | 97.6% | 86.2% | 84.3% |
| Completed high school | 97.6% | 84.7% | 83.0% |
| Completed some college | 86.5% | 61.8% | 59.4% |
| Completed associate degree | 62.8% | 40.7% | 38.5% |
| Completed bachelors | 34.8% | 32.9% | 30.3% |
| Completed masters | 5.5% | 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 Grand Detour. Using the proficiency score averages, the average test scores for Grand Detour, IL schools is n/a. The average student to teacher ratio is n/a. In Grand Detour, IL, an average of 97.6% of students have completed 8th grade and an average of 97.6% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Stillman Valley, IL | 1,400 | 40% | 16.7% |
| Polo, IL | 2,286 | 39% | 19.1% |
| Rock Falls, IL | 9,152 | 30% | 37.1% |
| Amboy, IL | 2,539 | 30% | 37.2% |
| Sterling, IL | 15,351 | 28% | 41.7% |
| Grand Detour, IL | 363 | n/a |
| City | Population | Avg. Test Scores | National Avg. |
| Paint Rock, TX | 363 | 32% | 33.3% |
| Uniontown, KS | 363 | 33% | 30.7% |
| Barryton, MI | 363 | 45% | 7.3% |
| Spottsville, KY | 363 | 72% | 50.0% |
| New Meadows, ID | 363 | 47% | 2.1% |
| Grand Detour, IL | 363 | n/a |