| Index | Erwin | South Dakota | National |
| Average Test Scores | n/a | 48% | 48% |
| Student/Teacher ratio | n/a | 14:1 | 16:1 |
| Total public schools | n/a | 340 | 79,221 |
| Total private schools | n/a | 76 | 24,874 |
| Total post-secondary schools | n/a | 25 | 7,963 |
| Index | Erwin | South Dakota | National |
| Completed 8th grade | 80.5% | 89.1% | 84.3% |
| Completed high school | 80.5% | 86.8% | 83.0% |
| Completed some college | 51.2% | 60.4% | 59.4% |
| Completed associate degree | 34.1% | 38.5% | 38.5% |
| Completed bachelors | 29.3% | 27.5% | 30.3% |
| Completed masters | 14.6% | 8.1% | 11.5% |
| Completed professional degree | 14.6% | 2.5% | 3.3% |
| Completed doctorate | 0.0% | 1.2% | 1.3% |
There are a total of n/a public schools, n/a private schools and n/a post-secondary schools in Erwin. Using the proficiency score averages, the average test scores for Erwin, SD schools is n/a. The average student to teacher ratio is n/a. In Erwin, SD, an average of 80.5% of students have completed 8th grade and an average of 80.5% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Hayti, SD | 391 | 64% | 32.6% |
| De Smet, SD | 1,041 | 61% | 26.4% |
| Lake Preston, SD | 448 | 53% | 11.1% |
| Willow Lake, SD | 445 | 50% | 4.2% |
| Erwin, SD | 54 | n/a |
| City | Population | Avg. Test Scores | National Avg. |
| Perryville, AK | 54 | 50% | 4.2% |
| Fellows, CA | 54 | 50% | 3.1% |
| Catlett, VA | 54 | 70% | 44.8% |
| Rampart, AK | 54 | 50% | 4.2% |
| Thornburg, IA | 55 | 62% | 28.1% |
| Erwin, SD | 54 | n/a |
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