| Index | Selby | South Dakota | National |
| Average Test Scores | 52% | 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 | Selby | South Dakota | National |
| Completed 8th grade | 81.2% | 89.1% | 84.3% |
| Completed high school | 77.0% | 86.8% | 83.0% |
| Completed some college | 39.6% | 60.4% | 59.4% |
| Completed associate degree | 21.2% | 38.5% | 38.5% |
| Completed bachelors | 8.4% | 27.5% | 30.3% |
| Completed masters | 0.6% | 8.1% | 11.5% |
| Completed professional degree | 0.0% | 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 Selby. Using the proficiency score averages, the average test scores for Selby, SD schools is 52%. The average student to teacher ratio is n/a. In Selby, SD, an average of 81.2% of students have completed 8th grade and an average of 77.0% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Selby, SD | 526 | 52% | 7.6% |
| City | Population | Avg. Test Scores | National Avg. |
| Mercer, WI | 526 | 40% | 17.7% |
| Rose Bud, AR | 526 | 46% | 4.2% |
| Maynard, IA | 526 | 70% | 45.3% |
| Olpe, KS | 526 | 53% | 10.9% |
| Kimball, SD | 526 | 57% | 18.2% |
| Selby, SD | 526 | 52% | 7.6% |
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