| Index | Castaic | California | National |
| Average Test Scores | 53% | 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 |
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| 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 53%. 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 | Population | Avg. Test Scores | National Avg. |
| Stevenson Ranch, CA | 19,485 | 81% | 67.7% |
| Santa Clarita, CA | 218,105 | 56% | 16.4% |
| Moorpark, CA | 37,262 | 56% | 16.3% |
| Lake Hughes, CA | 677 | 47% | 2.1% |
| Simi Valley, CA | 130,307 | 38% | 21.4% |
| Castaic, CA | 19,003 | 53% | 9.6% |
| City | Population | Avg. Test Scores | National Avg. |
| Rancho Mirage, CA | 19,003 | 44% | 7.8% |
| Gautier, MS | 19,005 | 47% | 2.6% |
| Sartell, MN | 19,015 | 64% | 32.5% |
| Eloy, AZ | 18,990 | 28% | 41.5% |
| Hyattsville, MD | 18,985 | 23% | 52.5% |
| Castaic, CA | 19,003 | 53% | 9.6% |
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