| Index | Clay City | Illinois | National |
| Average Test Scores | 26% | 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 | Clay City | Illinois | National |
| Completed 8th grade | 75.5% | 86.2% | 84.3% |
| Completed high school | 70.5% | 84.7% | 83.0% |
| Completed some college | 33.0% | 61.8% | 59.4% |
| Completed associate degree | 14.3% | 40.7% | 38.5% |
| Completed bachelors | 8.5% | 32.9% | 30.3% |
| Completed masters | 0.7% | 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 Clay City. Using the proficiency score averages, the average test scores for Clay City, IL schools is 26%. The average student to teacher ratio is n/a. In Clay City, IL, an average of 75.5% of students have completed 8th grade and an average of 70.5% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Johnsonville, IL | 50 | 50% | 4.2% |
| Mount Erie, IL | 114 | 40% | 16.7% |
| Olney, IL | 8,872 | 29% | 40.6% |
| Flora, IL | 4,686 | 28% | 41.7% |
| Cisne, IL | 505 | 27% | 43.2% |
| Clay City, IL | 896 | 26% | 45.1% |
| City | Population | Avg. Test Scores | National Avg. |
| South Webster, OH | 896 | 77% | 59.4% |
| Courtland, AL | 896 | 15% | 69.8% |
| Cankton, LA | 896 | 72% | 50.0% |
| Export, PA | 896 | 72% | 50.0% |
| Chateaugay, NY | 896 | 51% | 5.7% |
| Clay City, IL | 896 | 26% | 45.1% |
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