| Index | El Castillo | Texas | National |
| Average Test Scores | n/a | 47% | 48% |
| Student/Teacher ratio | n/a | 14:1 | 16:1 |
| Total public schools | n/a | 7,418 | 79,221 |
| Total private schools | n/a | 1,267 | 24,874 |
| Total post-secondary schools | n/a | 463 | 7,963 |
| Index | El Castillo | Texas | National |
| Completed 8th grade | 39.0% | 79.3% | 84.3% |
| Completed high school | 39.0% | 77.8% | 83.0% |
| Completed some college | 19.9% | 57.3% | 59.4% |
| Completed associate degree | 0.0% | 34.9% | 38.5% |
| Completed bachelors | 0.0% | 28.1% | 30.3% |
| Completed masters | 0.0% | 9.6% | 11.5% |
| Completed professional degree | 0.0% | 2.6% | 3.3% |
| Completed doctorate | 0.0% | 1.1% | 1.3% |
There are a total of n/a public schools, n/a private schools and n/a post-secondary schools in El Castillo. Using the proficiency score averages, the average test scores for El Castillo, TX schools is n/a. The average student to teacher ratio is n/a. In El Castillo, TX, an average of 39.0% of students have completed 8th grade and an average of 39.0% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| La Joya, TX | 4,374 | 62% | 29.8% |
| Rio Grande City, TX | 14,411 | 47% | 1.2% |
| Penitas, TX | 6,103 | 45% | 5.5% |
| Sullivan City, TX | 4,187 | 45% | 7.3% |
| Garciasville, TX | 0 | 40% | 17.7% |
| El Castillo, TX | 64 | n/a |
| City | Population | Avg. Test Scores | National Avg. |
| Harrison, MT | 64 | 53% | 11.1% |
| McKinnon, WY | 65 | 50% | 4.2% |
| Fancy Gap, VA | 65 | 91% | 89.6% |
| Halsey, NE | 63 | 50% | 4.2% |
| Orrum, NC | 63 | 16% | 66.7% |
| El Castillo, TX | 64 | n/a |
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