| Index | Cromwell | Iowa | National |
| Average Test Scores | n/a | 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 | Cromwell | Iowa | National |
| Completed 8th grade | 90.3% | 89.2% | 84.3% |
| Completed high school | 90.3% | 87.7% | 83.0% |
| Completed some college | 52.8% | 59.8% | 59.4% |
| Completed associate degree | 33.3% | 38.4% | 38.5% |
| Completed bachelors | 15.3% | 27.2% | 30.3% |
| Completed masters | 5.6% | 8.7% | 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 Cromwell. Using the proficiency score averages, the average test scores for Cromwell, IA schools is n/a. The average student to teacher ratio is n/a. In Cromwell, IA, an average of 90.3% of students have completed 8th grade and an average of 90.3% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Lenox, IA | 1,446 | 73% | 52.6% |
| Afton, IA | 901 | 71% | 47.4% |
| Creston, IA | 7,754 | 65% | 34.4% |
| Orient, IA | 434 | 63% | 30.2% |
| Corning, IA | 1,671 | 60% | 24.5% |
| Cromwell, IA | 72 | n/a |
| City | Population | Avg. Test Scores | National Avg. |
| Twin Hills, AK | 71 | 20% | 58.3% |
| Kim, CO | 71 | 45% | 6.3% |
| Wikieup, AZ | 71 | 50% | 4.2% |
| Wasta, SD | 73 | 50% | 4.2% |
| Bartlett, KS | 71 | 42% | 12.5% |
| Cromwell, IA | 72 | n/a |
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