| Index | Castle | Oklahoma | National |
| Average Test Scores | n/a | 32% | 48% |
| Student/Teacher ratio | n/a | 22:1 | 16:1 |
| Total public schools | n/a | 1,346 | 79,221 |
| Total private schools | n/a | 159 | 24,874 |
| Total post-secondary schools | n/a | 178 | 7,963 |
| Index | Castle | Oklahoma | National |
| Completed 8th grade | 53.3% | 83.5% | 84.3% |
| Completed high school | 51.1% | 82.2% | 83.0% |
| Completed some college | 25.6% | 55.6% | 59.4% |
| Completed associate degree | 3.3% | 31.9% | 38.5% |
| Completed bachelors | 0.0% | 24.5% | 30.3% |
| Completed masters | 0.0% | 8.1% | 11.5% |
| Completed professional degree | 0.0% | 2.3% | 3.3% |
| Completed doctorate | 0.0% | 1.0% | 1.3% |
There are a total of n/a public schools, n/a private schools and n/a post-secondary schools in Castle. Using the proficiency score averages, the average test scores for Castle, OK schools is n/a. The average student to teacher ratio is n/a. In Castle, OK, an average of 53.3% of students have completed 8th grade and an average of 51.1% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Paden, OK | 421 | 32% | 32.8% |
| Okemah, OK | 3,275 | 24% | 50.8% |
| Weleetka, OK | 1,012 | 22% | 53.3% |
| Cromwell, OK | 307 | 19% | 61.5% |
| Castle, OK | 227 | n/a |
| City | Population | Avg. Test Scores | National Avg. |
| Calvin, LA | 227 | 67% | 39.6% |
| Carney, MI | 227 | 32% | 33.3% |
| Mallard, IA | 227 | 92% | 91.7% |
| Cordova, SC | 227 | 39% | 19.8% |
| Springview, NE | 227 | 35% | 27.1% |
| Castle, OK | 227 | n/a |
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