| Index | Walnut | 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 | Walnut | Iowa | National |
| Completed 8th grade | 88.9% | 89.2% | 84.3% |
| Completed high school | 87.6% | 87.7% | 83.0% |
| Completed some college | 47.9% | 59.8% | 59.4% |
| Completed associate degree | 26.0% | 38.4% | 38.5% |
| Completed bachelors | 15.3% | 27.2% | 30.3% |
| Completed masters | 5.9% | 8.7% | 11.5% |
| Completed professional degree | 1.3% | 2.7% | 3.3% |
| Completed doctorate | 0.4% | 1.1% | 1.3% |
There are a total of n/a public schools, n/a private schools and n/a post-secondary schools in Walnut. Using the proficiency score averages, the average test scores for Walnut, IA schools is n/a. The average student to teacher ratio is n/a. In Walnut, IA, an average of 88.9% of students have completed 8th grade and an average of 87.6% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Harlan, IA | 4,813 | 81% | 68.1% |
| Avoca, IA | 1,368 | 77% | 61.1% |
| Lewis, IA | 513 | 75% | 56.3% |
| Oakland, IA | 1,665 | 70% | 45.3% |
| Atlantic, IA | 6,600 | 69% | 43.0% |
| Walnut, IA | 746 | n/a |
| City | Population | Avg. Test Scores | National Avg. |
| Watkins, CO | 746 | 20% | 58.3% |
| Corydon, KY | 746 | 57% | 18.8% |
| Hancock, MN | 746 | 67% | 39.6% |
| Holcomb, MO | 746 | 37% | 22.9% |
| Meeteetse, WY | 746 | 60% | 25.0% |
| Walnut, IA | 746 | n/a |
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