| Index | Clark | Missouri | National |
| Average Test Scores | n/a | 44% | 48% |
| Student/Teacher ratio | n/a | 14:1 | 16:1 |
| Total public schools | n/a | 1,899 | 79,221 |
| Total private schools | n/a | 531 | 24,874 |
| Total post-secondary schools | n/a | 213 | 7,963 |
| Index | Clark | Missouri | National |
| Completed 8th grade | 79.7% | 86.0% | 84.3% |
| Completed high school | 75.3% | 84.2% | 83.0% |
| Completed some college | 38.0% | 57.7% | 59.4% |
| Completed associate degree | 6.3% | 35.2% | 38.5% |
| Completed bachelors | 5.1% | 27.6% | 30.3% |
| Completed masters | 0.0% | 10.4% | 11.5% |
| Completed professional degree | 0.0% | 2.8% | 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 Clark. Using the proficiency score averages, the average test scores for Clark, MO schools is n/a. The average student to teacher ratio is n/a. In Clark, MO, an average of 79.7% of students have completed 8th grade and an average of 75.3% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Centralia, MO | 4,260 | 58% | 20.1% |
| Hallsville, MO | 1,686 | 53% | 9.4% |
| Huntsville, MO | 1,820 | 51% | 6.3% |
| Sturgeon, MO | 1,102 | 43% | 10.4% |
| Holliday, MO | 120 | 40% | 16.7% |
| Clark, MO | 252 | n/a |
| City | Population | Avg. Test Scores | National Avg. |
| Wynot, NE | 252 | 52% | 7.6% |
| Maxwell, NE | 252 | 36% | 25.5% |
| Ovid, CO | 252 | 50% | 4.2% |
| Dixon, MT | 252 | 50% | 4.2% |
| Lava Hot Springs, ID | 253 | 75% | 56.3% |
| Clark, MO | 252 | n/a |
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