| Index | Rio Dell | California | National |
| Average Test Scores | 28% | 43% | 48% |
| Student/Teacher ratio | 21:1 | 20:1 | 16:1 |
| Total public schools | 2 | 8,308 | 79,221 |
| Total private schools | n/a | 3,438 | 24,874 |
| Total post-secondary schools | n/a | 1,085 | 7,963 |
| Index | Rio Dell | California | National |
| Completed 8th grade | 83.4% | 81.1% | 84.3% |
| Completed high school | 82.8% | 79.8% | 83.0% |
| Completed some college | 57.4% | 61.5% | 59.4% |
| Completed associate degree | 21.8% | 39.8% | 38.5% |
| Completed bachelors | 10.6% | 32.0% | 30.3% |
| Completed masters | 0.6% | 11.9% | 11.5% |
| Completed professional degree | 0.1% | 3.9% | 3.3% |
| Completed doctorate | 0.0% | 1.6% | 1.3% |
There are a total of 2 public schools, n/a private schools and n/a post-secondary schools in Rio Dell. Using the proficiency score averages, the average test scores for Rio Dell, CA schools is 28%. The average student to teacher ratio is 21:1. In Rio Dell, CA, an average of 83.4% of students have completed 8th grade and an average of 82.8% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Scotia, CA | 508 | 50% | 3.1% |
| Hydesville, CA | 1,084 | 50% | 3.1% |
| Fortuna, CA | 12,532 | 37% | 23.6% |
| Ferndale, CA | 1,424 | 36% | 24.5% |
| Weott, CA | 129 | 35% | 27.1% |
| Rio Dell, CA | 3,481 | 28% | 41.1% |
| City | Population | Avg. Test Scores | National Avg. |
| Hanover, MN | 3,482 | 81% | 67.7% |
| Palmyra, NY | 3,480 | 64% | 33.3% |
| Fort Branch, IN | 3,484 | 64% | 32.3% |
| Newcastle, WY | 3,484 | 55% | 13.5% |
| Clayton, DE | 3,485 | 51% | 7.0% |
| Rio Dell, CA | 3,481 | 28% | 41.1% |
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