| Index | Cortland | Illinois | National |
| Average Test Scores | 23% | 33% | 48% |
| Student/Teacher ratio | 16:1 | 18:1 | 16:1 |
| Total public schools | 1 | 3,938 | 79,221 |
| Total private schools | n/a | 1,438 | 24,874 |
| Total post-secondary schools | n/a | 306 | 7,963 |
| Index | Cortland | Illinois | National |
| Completed 8th grade | 90.6% | 86.2% | 84.3% |
| Completed high school | 90.6% | 84.7% | 83.0% |
| Completed some college | 70.0% | 61.8% | 59.4% |
| Completed associate degree | 42.3% | 40.7% | 38.5% |
| Completed bachelors | 28.9% | 32.9% | 30.3% |
| Completed masters | 9.4% | 12.7% | 11.5% |
| Completed professional degree | 2.1% | 3.4% | 3.3% |
| Completed doctorate | 2.1% | 1.2% | 1.3% |
There are a total of 1 public schools, n/a private schools and n/a post-secondary schools in Cortland. Using the proficiency score averages, the average test scores for Cortland, IL schools is 23%. The average student to teacher ratio is 16:1. In Cortland, IL, an average of 90.6% of students have completed 8th grade and an average of 90.6% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Campton Hills, IL | 10,962 | 61% | 26.0% |
| Big Rock, IL | 1,271 | 55% | 13.5% |
| Burlington, IL | 514 | 54% | 12.5% |
| Maple Park, IL | 1,599 | 50% | 4.7% |
| Hinckley, IL | 2,190 | 46% | 4.2% |
| Cortland, IL | 4,261 | 23% | 52.1% |
| City | Population | Avg. Test Scores | National Avg. |
| Medina, TN | 4,260 | 59% | 23.6% |
| Centralia, MO | 4,260 | 58% | 20.1% |
| Morgan, UT | 4,259 | 48% | = 100 |
| Lyons, GA | 4,263 | 40% | 15.9% |
| Brookfield, MO | 4,265 | 48% | = 100 |
| Cortland, IL | 4,261 | 23% | 52.1% |
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