| Index | Charter Oak | Iowa | National |
| Average Test Scores | 59% | 69% | 48% |
| Student/Teacher ratio | n/a | 13:1 | 16:1 |
| Total public schools | n/a | 1,101 | 79,221 |
| Total private schools | n/a | 208 | 24,874 |
| Total post-secondary schools | n/a | 96 | 7,963 |
| Index | Charter Oak | Iowa | National |
| Completed 8th grade | 86.1% | 89.2% | 84.3% |
| Completed high school | 83.1% | 87.7% | 83.0% |
| Completed some college | 49.7% | 59.8% | 59.4% |
| Completed associate degree | 22.9% | 38.4% | 38.5% |
| Completed bachelors | 11.1% | 27.2% | 30.3% |
| Completed masters | 3.2% | 8.7% | 11.5% |
| Completed professional degree | 0.5% | 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 Charter Oak. Using the proficiency score averages, the average test scores for Charter Oak, IA schools is 59%. The average student to teacher ratio is n/a. In Charter Oak, IA, an average of 86.1% of students have completed 8th grade and an average of 83.1% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Dow City, IA | 440 | 75% | 55.2% |
| Schleswig, IA | 979 | 74% | 53.1% |
| Dunlap, IA | 1,214 | 70% | 44.8% |
| Mapleton, IA | 1,173 | 67% | 40.1% |
| Denison, IA | 8,319 | 63% | 31.3% |
| Charter Oak, IA | 570 | 59% | 21.9% |
| City | Population | Avg. Test Scores | National Avg. |
| Motley, MN | 570 | 45% | 7.3% |
| Chireno, TX | 570 | 44% | 9.4% |
| Roberts, ID | 570 | 25% | 49.0% |
| Tall Timbers, MD | 570 | 50% | 4.2% |
| Macksville, KS | 570 | 30% | 38.0% |
| Charter Oak, IA | 570 | 59% | 21.9% |
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