| Index | Custar | 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 |
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| Index | Custar | Ohio | National |
| Completed 8th grade | 91.4% | 86.9% | 84.3% |
| Completed high school | 91.4% | 85.6% | 83.0% |
| Completed some college | 44.4% | 55.7% | 59.4% |
| Completed associate degree | 9.9% | 35.1% | 38.5% |
| Completed bachelors | 1.2% | 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 Custar. Using the proficiency score averages, the average test scores for Custar, OH schools is n/a. The average student to teacher ratio is n/a. In Custar, OH, an average of 91.4% of students have completed 8th grade and an average of 91.4% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Waterville, OH | 5,519 | 91% | 89.6% |
| Miller City, OH | 142 | 87% | 80.9% |
| Van Buren, OH | 477 | 85% | 76.4% |
| Holgate, OH | 1,149 | 77% | 60.4% |
| Liberty Center, OH | 1,051 | 76% | 57.6% |
| Custar, OH | 261 | n/a |
| City | Population | Avg. Test Scores | National Avg. |
| Charlo, MT | 261 | 54% | 12.5% |
| Belfry, KY | 261 | 52% | 8.3% |
| Acampo, CA | 261 | 39% | 19.1% |
| Kingston, MO | 261 | 20% | 58.3% |
| Harrisonburg, LA | 262 | 80% | 65.6% |
| Custar, OH | 261 | n/a |
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