| Index | Millbrook | Illinois | National |
| Average Test Scores | 52% | 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 | Millbrook | Illinois | National |
| Completed 8th grade | 92.5% | 86.2% | 84.3% |
| Completed high school | 91.7% | 84.7% | 83.0% |
| Completed some college | 64.4% | 61.8% | 59.4% |
| Completed associate degree | 31.6% | 40.7% | 38.5% |
| Completed bachelors | 17.4% | 32.9% | 30.3% |
| Completed masters | 3.6% | 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 Millbrook. Using the proficiency score averages, the average test scores for Millbrook, IL schools is 52%. The average student to teacher ratio is n/a. In Millbrook, IL, an average of 92.5% of students have completed 8th grade and an average of 91.7% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Big Rock, IL | 1,271 | 55% | 13.5% |
| Newark, IL | 1,325 | 50% | 3.5% |
| Channahon, IL | 13,281 | 48% | 0.7% |
| Hinckley, IL | 2,190 | 46% | 4.2% |
| Yorkville, IL | 19,386 | 46% | 4.4% |
| Millbrook, IL | 357 | 52% | 8.3% |
| City | Population | Avg. Test Scores | National Avg. |
| Willisburg, KY | 357 | 61% | 26.0% |
| Forest, LA | 357 | 62% | 28.1% |
| Shonto, AZ | 357 | 31% | 34.9% |
| City of Creede, CO | 357 | 35% | 27.1% |
| Maynard, MN | 357 | 60% | 24.0% |
| Millbrook, IL | 357 | 52% | 8.3% |
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