| Index | Decatur City | 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 | Decatur City | Iowa | National |
| Completed 8th grade | 92.6% | 89.2% | 84.3% |
| Completed high school | 81.5% | 87.7% | 83.0% |
| Completed some college | 36.3% | 59.8% | 59.4% |
| Completed associate degree | 12.6% | 38.4% | 38.5% |
| Completed bachelors | 7.4% | 27.2% | 30.3% |
| Completed masters | 0.0% | 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 Decatur City. Using the proficiency score averages, the average test scores for Decatur City, IA schools is n/a. The average student to teacher ratio is n/a. In Decatur City, IA, an average of 92.6% of students have completed 8th grade and an average of 81.5% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Garden Grove, IA | 203 | 70% | 45.8% |
| Lamoni, IA | 2,339 | 66% | 36.5% |
| Leon, IA | 1,883 | 64% | 32.3% |
| Decatur City, IA | 192 | n/a |
| City | Population | Avg. Test Scores | National Avg. |
| Autryville, NC | 192 | 72% | 50.0% |
| Loachapoka, AL | 192 | 23% | 51.6% |
| Blackwell, TX | 192 | 55% | 13.5% |
| Russian Mission, AK | 193 | 5% | 89.6% |
| Mellette, SD | 191 | 50% | 4.2% |
| Decatur City, IA | 192 | n/a |
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