| 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 | 33 | 50% | 4.2% |
| Henry, SD | 306 | 47% | 2.8% |
| Garden City, SD | 97 | 20% | 58.3% |
| Clark, SD | 1,272 | 42% | 11.7% |
| City | Population | Avg. Test Scores | National Avg. |
| Newville, PA | 1,272 | 63% | 31.5% |
| Milford, IL | 1,272 | 36% | 25.5% |
| Brilliant, AL | 1,272 | 47% | 2.1% |
| Shelton, NE | 1,272 | 46% | 4.7% |
| Willow Creek, CA | 1,273 | 25% | 49.0% |
| Clark, SD | 1,272 | 42% | 11.7% |
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