| Index | Castroville | Texas | National |
| Average Test Scores | 58% | 47% | 48% |
| Student/Teacher ratio | 17:1 | 14:1 | 16:1 |
| Total public schools | 6 | 7,418 | 79,221 |
| Total private schools | 2 | 1,267 | 24,874 |
| Total post-secondary schools | n/a | 463 | 7,963 |
| Index | Castroville | Texas | National |
| Completed 8th grade | 85.4% | 79.3% | 84.3% |
| Completed high school | 83.4% | 77.8% | 83.0% |
| Completed some college | 56.3% | 57.3% | 59.4% |
| Completed associate degree | 36.5% | 34.9% | 38.5% |
| Completed bachelors | 24.1% | 28.1% | 30.3% |
| Completed masters | 8.8% | 9.6% | 11.5% |
| Completed professional degree | 0.8% | 2.6% | 3.3% |
| Completed doctorate | 0.2% | 1.1% | 1.3% |
There are a total of 6 public schools, 2 private schools and n/a post-secondary schools in Castroville. Using the proficiency score averages, the average test scores for Castroville, TX schools is 58%. The average student to teacher ratio is 17:1. In Castroville, TX, an average of 85.4% of students have completed 8th grade and an average of 83.4% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Helotes, TX | 9,525 | 69% | 44.4% |
| LaCoste, TX | 1,936 | 53% | 10.4% |
| Devine, TX | 4,829 | 46% | 4.5% |
| Somerset, TX | 1,821 | 43% | 11.5% |
| Von Ormy, TX | 1,022 | 34% | 29.4% |
| Castroville, TX | 3,097 | 58% | 20.8% |
| City | Population | Avg. Test Scores | National Avg. |
| Olney, TX | 3,098 | 64% | 33.7% |
| Dover, FL | 3,098 | 46% | 5.2% |
| Shrub Oak, NY | 3,094 | 97% | 102.1% |
| Lucedale, MS | 3,094 | 40% | 17.6% |
| West Union, OH | 3,094 | 50% | 4.2% |
| Castroville, TX | 3,097 | 58% | 20.8% |
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