| Index | Garretson | South Dakota | National |
| Average Test Scores | 45% | 48% | 48% |
| Student/Teacher ratio | 14:1 | 14:1 | 16:1 |
| Total public schools | 3 | 340 | 79,221 |
| Total private schools | n/a | 76 | 24,874 |
| Total post-secondary schools | n/a | 25 | 7,963 |
| Index | Garretson | South Dakota | National |
| Completed 8th grade | 95.1% | 89.1% | 84.3% |
| Completed high school | 93.4% | 86.8% | 83.0% |
| Completed some college | 59.0% | 60.4% | 59.4% |
| Completed associate degree | 34.8% | 38.5% | 38.5% |
| Completed bachelors | 23.7% | 27.5% | 30.3% |
| Completed masters | 8.0% | 8.1% | 11.5% |
| Completed professional degree | 1.0% | 2.5% | 3.3% |
| Completed doctorate | 0.0% | 1.2% | 1.3% |
There are a total of 3 public schools, n/a private schools and n/a post-secondary schools in Garretson. Using the proficiency score averages, the average test scores for Garretson, SD schools is 45%. The average student to teacher ratio is 14:1. In Garretson, SD, an average of 95.1% of students have completed 8th grade and an average of 93.4% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Valley Springs, SD | 885 | 85% | 77.1% |
| Beaver Creek, MN | 341 | 80% | 65.6% |
| Brandon, SD | 10,030 | 70% | 46.0% |
| Dell Rapids, SD | 3,678 | 64% | 34.0% |
| Luverne, MN | 4,557 | 63% | 31.9% |
| Garretson, SD | 1,493 | 45% | 6.9% |
| City | Population | Avg. Test Scores | National Avg. |
| Durand, IL | 1,493 | 30% | 36.7% |
| Bedford, IA | 1,493 | 82% | 70.8% |
| Redkey, IN | 1,493 | 55% | 13.5% |
| Traer, IA | 1,493 | 66% | 37.0% |
| Colma, CA | 1,492 | 38% | 20.8% |
| Garretson, SD | 1,493 | 45% | 6.9% |
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