| Index | Greenfield | Illinois | National |
| Average Test Scores | 36% | 33% | 48% |
| Student/Teacher ratio | 22:1 | 18:1 | 16:1 |
| Total public schools | 2 | 3,938 | 79,221 |
| Total private schools | n/a | 1,438 | 24,874 |
| Total post-secondary schools | n/a | 306 | 7,963 |
| Index | Greenfield | Illinois | National |
| Completed 8th grade | 83.7% | 86.2% | 84.3% |
| Completed high school | 77.2% | 84.7% | 83.0% |
| Completed some college | 33.4% | 61.8% | 59.4% |
| Completed associate degree | 19.4% | 40.7% | 38.5% |
| Completed bachelors | 11.1% | 32.9% | 30.3% |
| Completed masters | 2.8% | 12.7% | 11.5% |
| Completed professional degree | 0.5% | 3.4% | 3.3% |
| Completed doctorate | 0.0% | 1.2% | 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, IL schools is 36%. The average student to teacher ratio is 22:1. In Greenfield, IL, an average of 83.7% of students have completed 8th grade and an average of 77.2% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Medora, IL | 323 | 33% | 32.3% |
| Roodhouse, IL | 1,656 | 32% | 34.4% |
| Carrollton, IL | 2,590 | 29% | 40.6% |
| Palmyra, IL | 647 | 21% | 56.9% |
| White Hall, IL | 2,356 | 20% | 59.4% |
| Greenfield, IL | 1,481 | 36% | 25.0% |
| City | Population | Avg. Test Scores | National Avg. |
| Lewiston, CA | 1,481 | 35% | 27.1% |
| St. David, AZ | 1,481 | 46% | 4.9% |
| Pleasant Valley, NY | 1,481 | 43% | 11.5% |
| Beattyville, KY | 1,481 | 45% | 5.7% |
| Tarkio, MO | 1,481 | 45% | 7.3% |
| Greenfield, IL | 1,481 | 36% | 25.0% |
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