| Index | Essex | 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 | Essex | Illinois | National |
| Completed 8th grade | 84.3% | 86.2% | 84.3% |
| Completed high school | 83.4% | 84.7% | 83.0% |
| Completed some college | 50.2% | 61.8% | 59.4% |
| Completed associate degree | 25.0% | 40.7% | 38.5% |
| Completed bachelors | 16.2% | 32.9% | 30.3% |
| Completed masters | 5.0% | 12.7% | 11.5% |
| Completed professional degree | 1.5% | 3.4% | 3.3% |
| Completed doctorate | 0.4% | 1.2% | 1.3% |
There are a total of n/a public schools, n/a private schools and n/a post-secondary schools in Essex. Using the proficiency score averages, the average test scores for Essex, IL schools is n/a. The average student to teacher ratio is n/a. In Essex, IL, an average of 84.3% of students have completed 8th grade and an average of 83.4% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Coal City, IL | 4,941 | 49% | 1.3% |
| South Wilmington, IL | 702 | 45% | 6.3% |
| Chebanse, IL | 1,208 | 45% | 7.3% |
| Wilmington, IL | 5,883 | 42% | 12.2% |
| Morris, IL | 14,420 | 42% | 12.5% |
| Essex, IL | 1,083 | n/a |
| City | Population | Avg. Test Scores | National Avg. |
| Hargill, TX | 1,083 | 57% | 18.8% |
| Truman, MN | 1,083 | 44% | 9.4% |
| Germantown, NY | 1,084 | 52% | 8.3% |
| Satanta, KS | 1,082 | 26% | 46.4% |
| Gerber, CA | 1,084 | 22% | 54.2% |
| Essex, IL | 1,083 | n/a |
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