| Index | Old Mill Creek | Illinois | National |
| Average Test Scores | 55% | 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 | Old Mill Creek | Illinois | National |
| Completed 8th grade | 99.3% | 86.2% | 84.3% |
| Completed high school | 99.3% | 84.7% | 83.0% |
| Completed some college | 83.6% | 61.8% | 59.4% |
| Completed associate degree | 65.7% | 40.7% | 38.5% |
| Completed bachelors | 51.5% | 32.9% | 30.3% |
| Completed masters | 19.4% | 12.7% | 11.5% |
| Completed professional degree | 0.7% | 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 Old Mill Creek. Using the proficiency score averages, the average test scores for Old Mill Creek, IL schools is 55%. The average student to teacher ratio is n/a. In Old Mill Creek, IL, an average of 99.3% of students have completed 8th grade and an average of 99.3% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Libertyville, IL | 20,300 | 71% | 48.7% |
| Lake Forest, IL | 19,497 | 66% | 37.2% |
| Lake Bluff, IL | 5,540 | 64% | 32.8% |
| Silver Lake, WI | 2,506 | 62% | 28.1% |
| Pleasant Prairie, WI | 20,969 | 60% | 24.7% |
| Old Mill Creek, IL | 200 | 55% | 14.6% |
| City | Population | Avg. Test Scores | National Avg. |
| Damon, TX | 200 | 22% | 54.2% |
| Blue Diamond, NV | 200 | 50% | 4.2% |
| Lockhart, AL | 200 | 50% | 3.1% |
| Grayling, AK | 200 | 20% | 58.3% |
| Cosby, MO | 200 | 65% | 34.4% |
| Old Mill Creek, IL | 200 | 55% | 14.6% |
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