| Index | Onyx | California | National |
| Average Test Scores | n/a | 43% | 48% |
| Student/Teacher ratio | n/a | 20:1 | 16:1 |
| Total public schools | n/a | 8,308 | 79,221 |
| Total private schools | n/a | 3,438 | 24,874 |
| Total post-secondary schools | n/a | 1,085 | 7,963 |
| Index | Onyx | California | National |
| Completed 8th grade | 93.8% | 81.1% | 84.3% |
| Completed high school | 93.8% | 79.8% | 83.0% |
| Completed some college | 59.2% | 61.5% | 59.4% |
| Completed associate degree | 12.9% | 39.8% | 38.5% |
| Completed bachelors | 12.9% | 32.0% | 30.3% |
| Completed masters | 2.8% | 11.9% | 11.5% |
| Completed professional degree | 2.8% | 3.9% | 3.3% |
| Completed doctorate | 2.8% | 1.6% | 1.3% |
There are a total of n/a public schools, n/a private schools and n/a post-secondary schools in Onyx. Using the proficiency score averages, the average test scores for Onyx, CA schools is n/a. The average student to teacher ratio is n/a. In Onyx, CA, an average of 93.8% of students have completed 8th grade and an average of 93.8% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Weldon, CA | 2,160 | 35% | 28.1% |
| Kernville, CA | 791 | 30% | 37.5% |
| Lake Isabella, CA | 3,621 | 30% | 38.5% |
| Onyx, CA | 576 | n/a |
| City | Population | Avg. Test Scores | National Avg. |
| Interlaken, NY | 576 | 32% | 33.3% |
| Cairnbrook, PA | 576 | 51% | 5.7% |
| Yankeetown, FL | 576 | 47% | 2.1% |
| Austinburg, OH | 577 | 85% | 76.0% |
| Wibaux, MT | 575 | 47% | 2.8% |
| Onyx, CA | 576 | n/a |
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