| Index | Castaic | California | National |
| Average Test Scores | 45% | 38% | 49% |
| 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 | Castaic | California | National |
| Completed 8th grade | 90.5% | 81.1% | 84.3% |
| Completed high school | 90.2% | 79.8% | 83.0% |
| Completed some college | 72.0% | 61.5% | 59.4% |
| Completed associate degree | 44.6% | 39.8% | 38.5% |
| Completed bachelors | 34.2% | 32.0% | 30.3% |
| Completed masters | 9.1% | 11.9% | 11.5% |
| Completed professional degree | 2.0% | 3.9% | 3.3% |
| Completed doctorate | 0.8% | 1.6% | 1.3% |
There are a total of n/a public schools, n/a private schools and n/a post-secondary schools in Castaic. Using the proficiency score averages, the average test scores for Castaic, CA schools is 45%. The average student to teacher ratio is n/a. In Castaic, CA, an average of 90.5% of students have completed 8th grade and an average of 90.2% have completed high school.
| City, State | Population | Avg. Test Scores | National Avg. |
| Stevenson Ranch, CA | 19,737 | 76% | 53% |
| Moorpark, CA | 35,594 | 53% | 8% |
| Santa Clarita, CA | 180,303 | 51% | 4% |
| Lake Hughes, CA | 565 | 42% | 15% |
| Simi Valley, CA | 126,126 | 40% | 20% |
| Castaic, CA | 19,529 | 45% | 8% |
| City, State | Population | Avg. Test Scores | National Avg. |
| Bryant, AR | 19,529 | 41% | 17% |
| McKeesport, PA | 19,529 | 28% | 43% |
| Clemmons, NC | 19,536 | 64% | 29% |
| Upper St. Clair, PA | 19,521 | 81% | 64% |
| Papillion, NE | 19,520 | 86% | 76% |
| Castaic, CA | 19,529 | 45% | 8% |
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