| Index | DeKalb | Illinois | National |
| Average Test Scores | 20% | 33% | 48% |
| Student/Teacher ratio | 17:1 | 18:1 | 16:1 |
| Total public schools | 7 | 3,938 | 79,221 |
| Total private schools | 3 | 1,438 | 24,874 |
| Total post-secondary schools | 1 | 306 | 7,963 |
| Index | DeKalb | Illinois | National |
| Completed 8th grade | 89.3% | 86.2% | 84.3% |
| Completed high school | 88.3% | 84.7% | 83.0% |
| Completed some college | 70.5% | 61.8% | 59.4% |
| Completed associate degree | 48.7% | 40.7% | 38.5% |
| Completed bachelors | 38.6% | 32.9% | 30.3% |
| Completed masters | 16.2% | 12.7% | 11.5% |
| Completed professional degree | 4.5% | 3.4% | 3.3% |
| Completed doctorate | 3.4% | 1.2% | 1.3% |
There are a total of 7 public schools, 3 private schools and 1 post-secondary schools in DeKalb. Using the proficiency score averages, the average test scores for DeKalb, IL schools is 20%. The average student to teacher ratio is 17:1. In DeKalb, IL, an average of 89.3% of students have completed 8th grade and an average of 88.3% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| 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% |
| Hampshire, IL | 5,909 | 44% | 8.1% |
| DeKalb, IL | 42,961 | 20% | 57.4% |
| City | Population | Avg. Test Scores | National Avg. |
| Fond du Lac, WI | 42,944 | 38% | 20.4% |
| Goose Creek, SC | 42,944 | 48% | 0.2% |
| Winter Haven, FL | 42,933 | 47% | 2.5% |
| Freeport, NY | 42,993 | 57% | 17.7% |
| Campbell, CA | 42,891 | 59% | 23.3% |
| DeKalb, IL | 42,961 | 20% | 57.4% |
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