| Index | Plankinton | South Dakota | National |
| Average Test Scores | 39% | 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 | Plankinton | South Dakota | National |
| Completed 8th grade | 85.5% | 89.1% | 84.3% |
| Completed high school | 77.5% | 86.8% | 83.0% |
| Completed some college | 43.9% | 60.4% | 59.4% |
| Completed associate degree | 24.6% | 38.5% | 38.5% |
| Completed bachelors | 16.4% | 27.5% | 30.3% |
| Completed masters | 4.8% | 8.1% | 11.5% |
| Completed professional degree | 0.4% | 2.5% | 3.3% |
| Completed doctorate | 0.4% | 1.2% | 1.3% |
There are a total of n/a public schools, n/a private schools and n/a post-secondary schools in Plankinton. Using the proficiency score averages, the average test scores for Plankinton, SD schools is 39%. The average student to teacher ratio is n/a. In Plankinton, SD, an average of 85.5% of students have completed 8th grade and an average of 77.5% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Stickney, SD | 265 | 70% | 44.8% |
| Mount Vernon, SD | 500 | 48% | 0.7% |
| White Lake, SD | 437 | 37% | 23.6% |
| Plankinton, SD | 709 | 39% | 18.2% |
| City | Population | Avg. Test Scores | National Avg. |
| Welling, OK | 709 | 32% | 33.3% |
| Conway, MO | 709 | 39% | 18.2% |
| Onaga, KS | 709 | 40% | 17.2% |
| Hartford, IA | 709 | 72% | 49.0% |
| Bardwell, KY | 710 | 44% | 8.7% |
| Plankinton, SD | 709 | 39% | 18.2% |
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