| Index | Castlewood | Virginia | National |
| Average Test Scores | 85% | 79% | 48% |
| Student/Teacher ratio | 11:1 | 13:1 | 16:1 |
| Total public schools | 3 | 1,596 | 79,221 |
| Total private schools | n/a | 553 | 24,874 |
| Total post-secondary schools | n/a | 199 | 7,963 |
| Index | Castlewood | Virginia | National |
| Completed 8th grade | 80.6% | 85.9% | 84.3% |
| Completed high school | 73.8% | 84.7% | 83.0% |
| Completed some college | 38.2% | 64.1% | 59.4% |
| Completed associate degree | 15.5% | 44.2% | 38.5% |
| Completed bachelors | 6.5% | 36.9% | 30.3% |
| Completed masters | 2.1% | 15.7% | 11.5% |
| Completed professional degree | 0.0% | 4.2% | 3.3% |
| Completed doctorate | 0.0% | 1.7% | 1.3% |
There are a total of 3 public schools, n/a private schools and n/a post-secondary schools in Castlewood. Using the proficiency score averages, the average test scores for Castlewood, VA schools is 85%. The average student to teacher ratio is 11:1. In Castlewood, VA, an average of 80.6% of students have completed 8th grade and an average of 73.8% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| St. Paul, VA | 857 | 91% | 89.6% |
| Coeburn, VA | 1,472 | 90% | 87.8% |
| Nickelsville, VA | 359 | 88% | 82.8% |
| Lebanon, VA | 3,221 | 85% | 76.4% |
| Dungannon, VA | 302 | 85% | 76.0% |
| Castlewood, VA | 1,315 | 85% | 76.0% |
| City | Population | Avg. Test Scores | National Avg. |
| Bovina, TX | 1,315 | 31% | 34.7% |
| Salome, AZ | 1,315 | 20% | 58.9% |
| Monroeville, IN | 1,315 | 43% | 10.4% |
| Redway, CA | 1,315 | 37% | 22.9% |
| Hackberry, LA | 1,315 | 77% | 60.4% |
| Castlewood, VA | 1,315 | 85% | 76.0% |
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