| Index | Gridley | California | National |
| Average Test Scores | 43% | 43% | 48% |
| Student/Teacher ratio | 16:1 | 20:1 | 16:1 |
| Total public schools | 8 | 8,308 | 79,221 |
| Total private schools | n/a | 3,438 | 24,874 |
| Total post-secondary schools | n/a | 1,085 | 7,963 |
| Index | Gridley | California | National |
| Completed 8th grade | 72.0% | 81.1% | 84.3% |
| Completed high school | 68.2% | 79.8% | 83.0% |
| Completed some college | 48.5% | 61.5% | 59.4% |
| Completed associate degree | 20.9% | 39.8% | 38.5% |
| Completed bachelors | 14.5% | 32.0% | 30.3% |
| Completed masters | 3.5% | 11.9% | 11.5% |
| Completed professional degree | 2.1% | 3.9% | 3.3% |
| Completed doctorate | 0.0% | 1.6% | 1.3% |
There are a total of 8 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, CA schools is 43%. The average student to teacher ratio is 16:1. In Gridley, CA, an average of 72.0% of students have completed 8th grade and an average of 68.2% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Richvale, CA | 157 | 70% | 45.8% |
| Sutter, CA | 2,789 | 38% | 20.5% |
| Palermo, CA | 5,204 | 37% | 23.4% |
| Marysville, CA | 12,467 | 35% | 27.4% |
| Oroville, CA | 19,659 | 34% | 29.3% |
| Gridley, CA | 7,154 | 43% | 10.2% |
| City | Population | Avg. Test Scores | National Avg. |
| Knoxville, IA | 7,154 | 67% | 39.9% |
| Walled Lake, MI | 7,153 | 55% | 13.5% |
| Seminole, OK | 7,155 | 27% | 43.0% |
| St. Louis, MI | 7,156 | 31% | 36.2% |
| Heber Springs, AR | 7,156 | 59% | 22.6% |
| Gridley, CA | 7,154 | 43% | 10.2% |
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