| Index | Castalia | North Carolina | National |
| Average Test Scores | n/a | 43% | 48% |
| Student/Teacher ratio | n/a | 15:1 | 16:1 |
| Total public schools | n/a | 1,895 | 79,221 |
| Total private schools | n/a | 510 | 24,874 |
| Total post-secondary schools | n/a | 183 | 7,963 |
| Index | Castalia | North Carolina | National |
| Completed 8th grade | 71.2% | 83.4% | 84.3% |
| Completed high school | 67.6% | 81.9% | 83.0% |
| Completed some college | 31.6% | 59.9% | 59.4% |
| Completed associate degree | 14.4% | 38.1% | 38.5% |
| Completed bachelors | 7.2% | 29.0% | 30.3% |
| Completed masters | 0.0% | 10.2% | 11.5% |
| Completed professional degree | 0.0% | 2.9% | 3.3% |
| Completed doctorate | 0.0% | 1.3% | 1.3% |
There are a total of n/a public schools, n/a private schools and n/a post-secondary schools in Castalia. Using the proficiency score averages, the average test scores for Castalia, NC schools is n/a. The average student to teacher ratio is n/a. In Castalia, NC, an average of 71.2% of students have completed 8th grade and an average of 67.6% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Louisburg, NC | 3,694 | 40% | 16.0% |
| Bunn, NC | 449 | 39% | 19.4% |
| Nashville, NC | 5,521 | 32% | 34.4% |
| Red Oak, NC | 3,446 | 30% | 37.5% |
| Hollister, NC | 860 | 27% | 43.8% |
| Castalia, NC | 276 | n/a |
| City | Population | Avg. Test Scores | National Avg. |
| Manila, UT | 276 | 50% | 4.2% |
| Minocqua, WI | 276 | 46% | 4.2% |
| Edmore, ND | 276 | 75% | 56.3% |
| Olsburg, KS | 276 | 65% | 35.4% |
| Goodman, WI | 276 | 30% | 37.5% |
| Castalia, NC | 276 | n/a |
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