| Index | Marengo | Ohio | National |
| Average Test Scores | 64% | 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 | Marengo | Ohio | National |
| Completed 8th grade | 80.2% | 86.9% | 84.3% |
| Completed high school | 79.3% | 85.6% | 83.0% |
| Completed some college | 29.3% | 55.7% | 59.4% |
| Completed associate degree | 12.9% | 35.1% | 38.5% |
| Completed bachelors | 8.6% | 26.7% | 30.3% |
| Completed masters | 5.2% | 10.0% | 11.5% |
| Completed professional degree | 2.6% | 2.7% | 3.3% |
| Completed doctorate | 1.7% | 1.1% | 1.3% |
There are a total of n/a public schools, n/a private schools and n/a post-secondary schools in Marengo. Using the proficiency score averages, the average test scores for Marengo, OH schools is 64%. The average student to teacher ratio is n/a. In Marengo, OH, an average of 80.2% of students have completed 8th grade and an average of 79.3% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Galena, OH | 753 | 89% | 85.9% |
| Sunbury, OH | 5,934 | 79% | 65.3% |
| Fredericktown, OH | 2,510 | 76% | 58.7% |
| Delaware, OH | 41,818 | 75% | 55.2% |
| Centerburg, OH | 1,930 | 73% | 51.4% |
| Marengo, OH | 269 | 64% | 32.3% |
| City | Population | Avg. Test Scores | National Avg. |
| Milburn, OK | 269 | 36% | 25.0% |
| Blue Springs, NE | 269 | 37% | 22.9% |
| Axis, AL | 269 | 34% | 29.2% |
| Le Roy, MI | 269 | 45% | 7.3% |
| Hollandale, WI | 269 | 45% | 7.3% |
| Marengo, OH | 269 | 64% | 32.3% |
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