| Index | Greenfield | Iowa | National |
| Average Test Scores | 72% | 69% | 48% |
| Student/Teacher ratio | 12:1 | 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 |
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| Index | Greenfield | Iowa | National |
| Completed 8th grade | 92.8% | 89.2% | 84.3% |
| Completed high school | 89.4% | 87.7% | 83.0% |
| Completed some college | 50.4% | 59.8% | 59.4% |
| Completed associate degree | 31.5% | 38.4% | 38.5% |
| Completed bachelors | 15.3% | 27.2% | 30.3% |
| Completed masters | 4.5% | 8.7% | 11.5% |
| Completed professional degree | 1.6% | 2.7% | 3.3% |
| Completed doctorate | 0.9% | 1.1% | 1.3% |
There are a total of 2 public schools, n/a private schools and n/a post-secondary schools in Greenfield. Using the proficiency score averages, the average test scores for Greenfield, IA schools is 72%. The average student to teacher ratio is 12:1. In Greenfield, IA, an average of 92.8% of students have completed 8th grade and an average of 89.4% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Adair, IA | 814 | 81% | 68.2% |
| Stuart, IA | 1,623 | 75% | 55.7% |
| Fontanelle, IA | 673 | 75% | 55.2% |
| Dexter, IA | 564 | 65% | 34.4% |
| Orient, IA | 434 | 63% | 30.2% |
| Greenfield, IA | 1,736 | 72% | 50.5% |
| City | Population | Avg. Test Scores | National Avg. |
| Lovelock, NV | 1,736 | 34% | 28.9% |
| Big Timber, MT | 1,736 | 43% | 10.4% |
| Crandon, WI | 1,735 | 31% | 34.7% |
| Sparta, GA | 1,737 | 15% | 69.4% |
| Lac du Flambeau, WI | 1,737 | 18% | 63.5% |
| Greenfield, IA | 1,736 | 72% | 50.5% |
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