| Index | New Lenox | Illinois | National |
| Average Test Scores | 51% | 33% | 48% |
| Student/Teacher ratio | 20:1 | 18:1 | 16:1 |
| Total public schools | 11 | 3,938 | 79,221 |
| Total private schools | 4 | 1,438 | 24,874 |
| Total post-secondary schools | n/a | 306 | 7,963 |
| Index | New Lenox | Illinois | National |
| Completed 8th grade | 94.7% | 86.2% | 84.3% |
| Completed high school | 94.3% | 84.7% | 83.0% |
| Completed some college | 72.0% | 61.8% | 59.4% |
| Completed associate degree | 48.6% | 40.7% | 38.5% |
| Completed bachelors | 39.1% | 32.9% | 30.3% |
| Completed masters | 12.9% | 12.7% | 11.5% |
| Completed professional degree | 2.0% | 3.4% | 3.3% |
| Completed doctorate | 1.0% | 1.2% | 1.3% |
There are a total of 11 public schools, 4 private schools and n/a post-secondary schools in New Lenox. Using the proficiency score averages, the average test scores for New Lenox, IL schools is 51%. The average student to teacher ratio is 20:1. In New Lenox, IL, an average of 94.7% of students have completed 8th grade and an average of 94.3% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Hickory Hills, IL | 14,253 | 63% | 30.2% |
| Palos Park, IL | 4,779 | 61% | 26.6% |
| Frankfort, IL | 19,166 | 56% | 16.3% |
| Homer Glen, IL | 24,521 | 55% | 14.6% |
| Manhattan, IL | 8,218 | 54% | 12.5% |
| New Lenox, IL | 26,788 | 51% | 6.4% |
| City | Population | Avg. Test Scores | National Avg. |
| Hutto, TX | 26,778 | 46% | 4.8% |
| Florence, AZ | 26,777 | 31% | 34.8% |
| Prior Lake, MN | 26,775 | 66% | 37.6% |
| Winona, MN | 26,772 | 46% | 5.0% |
| Colleyville, TX | 26,766 | 71% | 47.7% |
| New Lenox, IL | 26,788 | 51% | 6.4% |
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