| Index | Sumner | Iowa | National |
| Average Test Scores | 71% | 69% | 48% |
| Student/Teacher ratio | 15:1 | 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 |
| Index | Sumner | Iowa | National |
| Completed 8th grade | 92.0% | 89.2% | 84.3% |
| Completed high school | 90.4% | 87.7% | 83.0% |
| Completed some college | 55.9% | 59.8% | 59.4% |
| Completed associate degree | 35.5% | 38.4% | 38.5% |
| Completed bachelors | 20.3% | 27.2% | 30.3% |
| Completed masters | 6.2% | 8.7% | 11.5% |
| Completed professional degree | 2.4% | 2.7% | 3.3% |
| Completed doctorate | 0.0% | 1.1% | 1.3% |
There are a total of 2 public schools, n/a private schools and n/a post-secondary schools in Sumner. Using the proficiency score averages, the average test scores for Sumner, IA schools is 71%. The average student to teacher ratio is 15:1. In Sumner, IA, an average of 92.0% of students have completed 8th grade and an average of 90.4% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Denver, IA | 1,759 | 90% | 87.2% |
| Readlyn, IA | 804 | 85% | 76.0% |
| New Hampton, IA | 3,413 | 77% | 60.1% |
| Maynard, IA | 506 | 70% | 45.3% |
| Fayette, IA | 1,141 | 70% | 44.8% |
| Sumner, IA | 2,224 | 71% | 47.9% |
| City | Population | Avg. Test Scores | National Avg. |
| Spencer, IN | 2,224 | 45% | 7.3% |
| Granby, MO | 2,224 | 48% | 0.5% |
| Wesson, MS | 2,224 | 49% | 2.1% |
| Fort Kent, ME | 2,223 | 39% | 19.8% |
| Park Falls, WI | 2,225 | 36% | 25.5% |
| Sumner, IA | 2,224 | 71% | 47.9% |
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