| Index | Gridley | Illinois | National |
| Average Test Scores | 42% | 33% | 48% |
| Student/Teacher ratio | 9:1 | 18:1 | 16:1 |
| Total public schools | 3 | 3,938 | 79,221 |
| Total private schools | n/a | 1,438 | 24,874 |
| Total post-secondary schools | n/a | 306 | 7,963 |
| Index | Gridley | Illinois | National |
| Completed 8th grade | 89.6% | 86.2% | 84.3% |
| Completed high school | 87.5% | 84.7% | 83.0% |
| Completed some college | 57.9% | 61.8% | 59.4% |
| Completed associate degree | 35.6% | 40.7% | 38.5% |
| Completed bachelors | 26.4% | 32.9% | 30.3% |
| Completed masters | 6.6% | 12.7% | 11.5% |
| Completed professional degree | 1.0% | 3.4% | 3.3% |
| Completed doctorate | 1.0% | 1.2% | 1.3% |
There are a total of 3 public schools, n/a private schools and n/a post-secondary schools in Gridley. Using the proficiency score averages, the average test scores for Gridley, IL schools is 42%. The average student to teacher ratio is 9:1. In Gridley, IL, an average of 89.6% of students have completed 8th grade and an average of 87.5% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Towanda, IL | 341 | 65% | 34.4% |
| Carlock, IL | 623 | 50% | 4.2% |
| Benson, IL | 460 | 50% | 3.1% |
| El Paso, IL | 2,854 | 48% | 0.5% |
| Hudson, IL | 2,128 | 37% | 22.9% |
| Gridley, IL | 1,384 | 42% | 13.5% |
| City | Population | Avg. Test Scores | National Avg. |
| Richmond, MN | 1,384 | 82% | 70.8% |
| Warner, OK | 1,384 | 52% | 8.3% |
| Tiltonsville, OH | 1,383 | 62% | 29.2% |
| Monrovia, IN | 1,383 | 46% | 4.9% |
| Wymore, NE | 1,385 | 42% | 12.5% |
| Gridley, IL | 1,384 | 42% | 13.5% |
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