| Index | Marengo | Iowa | National |
| Average Test Scores | 81% | 69% | 48% |
| Student/Teacher ratio | 13:1 | 13:1 | 16:1 |
| Total public schools | 2 | 1,101 | 79,221 |
| Total private schools | n/a | 208 | 24,874 |
| Total post-secondary schools | n/a | 96 | 7,963 |
| Index | Marengo | Iowa | National |
| Completed 8th grade | 88.7% | 89.2% | 84.3% |
| Completed high school | 85.0% | 87.7% | 83.0% |
| Completed some college | 43.2% | 59.8% | 59.4% |
| Completed associate degree | 19.9% | 38.4% | 38.5% |
| Completed bachelors | 10.6% | 27.2% | 30.3% |
| Completed masters | 3.3% | 8.7% | 11.5% |
| Completed professional degree | 0.3% | 2.7% | 3.3% |
| Completed doctorate | 0.0% | 1.1% | 1.3% |
There are a total of 2 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, IA schools is 81%. The average student to teacher ratio is 13:1. In Marengo, IA, an average of 88.7% of students have completed 8th grade and an average of 85.0% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Williamsburg, IA | 3,248 | 83% | 72.9% |
| Atkins, IA | 2,137 | 77% | 60.4% |
| Oxford, IA | 735 | 77% | 60.4% |
| Victor, IA | 1,010 | 73% | 52.6% |
| Belle Plaine, IA | 2,481 | 73% | 52.6% |
| Marengo, IA | 2,459 | 81% | 68.2% |
| City | Population | Avg. Test Scores | National Avg. |
| Beresford, SD | 2,460 | 50% | 3.1% |
| Hayti, MO | 2,458 | 18% | 63.0% |
| Gibsonia, PA | 2,458 | 87% | 80.7% |
| Hermann, MO | 2,460 | 50% | 4.9% |
| Croswell, MI | 2,457 | 46% | 3.4% |
| Marengo, IA | 2,459 | 81% | 68.2% |
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