| Index | Greenfield | Missouri | National |
| Average Test Scores | 42% | 44% | 48% |
| Student/Teacher ratio | 13:1 | 14:1 | 16:1 |
| Total public schools | 2 | 1,899 | 79,221 |
| Total private schools | 1 | 531 | 24,874 |
| Total post-secondary schools | n/a | 213 | 7,963 |
| Index | Greenfield | Missouri | National |
| Completed 8th grade | 75.1% | 86.0% | 84.3% |
| Completed high school | 74.7% | 84.2% | 83.0% |
| Completed some college | 38.9% | 57.7% | 59.4% |
| Completed associate degree | 15.5% | 35.2% | 38.5% |
| Completed bachelors | 11.8% | 27.6% | 30.3% |
| Completed masters | 5.0% | 10.4% | 11.5% |
| Completed professional degree | 0.6% | 2.8% | 3.3% |
| Completed doctorate | 0.6% | 1.2% | 1.3% |
There are a total of 2 public schools, 1 private schools and n/a post-secondary schools in Greenfield. Using the proficiency score averages, the average test scores for Greenfield, MO schools is 42%. The average student to teacher ratio is 13:1. In Greenfield, MO, an average of 75.1% of students have completed 8th grade and an average of 74.7% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Dadeville, MO | 248 | 65% | 35.4% |
| Ash Grove, MO | 1,404 | 48% | 0.5% |
| Fair Play, MO | 532 | 45% | 7.3% |
| Miller, MO | 699 | 40% | 17.7% |
| Lockwood, MO | 1,078 | 38% | 20.8% |
| Greenfield, MO | 1,401 | 42% | 12.5% |
| City | Population | Avg. Test Scores | National Avg. |
| Wheaton, MN | 1,401 | 62% | 29.2% |
| Panama, OK | 1,401 | 26% | 46.5% |
| Phoenix, IL | 1,402 | 13% | 72.9% |
| Arp, TX | 1,402 | 47% | 1.7% |
| Rich Hill, MO | 1,402 | 48% | 0.5% |
| Greenfield, MO | 1,401 | 42% | 12.5% |
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