| Index | Castine | Ohio | National |
| Average Test Scores | n/a | 61% | 48% |
| Student/Teacher ratio | n/a | 17:1 | 16:1 |
| Total public schools | n/a | 3,650 | 79,221 |
| Total private schools | n/a | 1,000 | 24,874 |
| Total post-secondary schools | n/a | 393 | 7,963 |
| Index | Castine | Ohio | National |
| Completed 8th grade | 73.9% | 86.9% | 84.3% |
| Completed high school | 73.9% | 85.6% | 83.0% |
| Completed some college | 21.7% | 55.7% | 59.4% |
| Completed associate degree | 11.6% | 35.1% | 38.5% |
| Completed bachelors | 1.4% | 26.7% | 30.3% |
| Completed masters | 0.0% | 10.0% | 11.5% |
| Completed professional degree | 0.0% | 2.7% | 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 Castine. Using the proficiency score averages, the average test scores for Castine, OH schools is n/a. The average student to teacher ratio is n/a. In Castine, OH, an average of 73.9% of students have completed 8th grade and an average of 73.9% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Pleasant Hill, OH | 1,495 | 80% | 65.6% |
| Brookville, OH | 6,255 | 79% | 63.9% |
| New Madison, OH | 1,086 | 77% | 60.4% |
| Arcanum, OH | 2,457 | 76% | 58.1% |
| Eaton, OH | 8,154 | 73% | 52.1% |
| Castine, OH | 138 | n/a |
| City | Population | Avg. Test Scores | National Avg. |
| Jim Falls, WI | 138 | 67% | 39.6% |
| Fort Shaw, MT | 138 | 45% | 6.3% |
| Boston, KY | 138 | 61% | 27.1% |
| Coal Center, PA | 138 | 60% | 24.0% |
| Washington, CA | 137 | 50% | 4.2% |
| Castine, OH | 138 | n/a |
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