| Index | Clark | South Dakota | National |
| Average Test Scores | 42% | 48% | 48% |
| Student/Teacher ratio | 13:1 | 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 | Clark | South Dakota | National |
| Completed 8th grade | 86.9% | 89.1% | 84.3% |
| Completed high school | 84.7% | 86.8% | 83.0% |
| Completed some college | 44.6% | 60.4% | 59.4% |
| Completed associate degree | 26.5% | 38.5% | 38.5% |
| Completed bachelors | 16.2% | 27.5% | 30.3% |
| Completed masters | 2.1% | 8.1% | 11.5% |
| Completed professional degree | 0.4% | 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 Clark. Using the proficiency score averages, the average test scores for Clark, SD schools is 42%. The average student to teacher ratio is 13:1. In Clark, SD, an average of 86.9% of students have completed 8th grade and an average of 84.7% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Raymond, SD | 31 | 50% | 4.2% |
| Henry, SD | 295 | 47% | 2.8% |
| Garden City, SD | 93 | 20% | 58.3% |
| Clark, SD | 1,233 | 42% | 11.7% |
| City | Population | Avg. Test Scores | National Avg. |
| Adrian, MN | 1,233 | 57% | 19.1% |
| Greenback, TN | 1,233 | 39% | 18.8% |
| Pirtleville, AZ | 1,233 | 40% | 17.7% |
| Greenup, KY | 1,233 | 41% | 15.1% |
| Litchfield, MI | 1,232 | 26% | 45.8% |
| Clark, SD | 1,233 | 42% | 11.7% |
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