| Index | Cosby | Missouri | National |
| Average Test Scores | 65% | 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 | Cosby | Missouri | National |
| Completed 8th grade | 84.1% | 86.0% | 84.3% |
| Completed high school | 78.6% | 84.2% | 83.0% |
| Completed some college | 47.6% | 57.7% | 59.4% |
| Completed associate degree | 18.3% | 35.2% | 38.5% |
| Completed bachelors | 11.9% | 27.6% | 30.3% |
| Completed masters | 4.8% | 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 Cosby. Using the proficiency score averages, the average test scores for Cosby, MO schools is 65%. The average student to teacher ratio is n/a. In Cosby, MO, an average of 84.1% of students have completed 8th grade and an average of 78.6% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Country Club, MO | 2,550 | 62% | 29.2% |
| Stewartsville, MO | 718 | 55% | 14.6% |
| King City, MO | 973 | 50% | 3.1% |
| Easton, MO | 313 | 50% | 3.1% |
| Rosendale, MO | 106 | 47% | 1.7% |
| Cosby, MO | 206 | 65% | 34.4% |
| City | Population | Avg. Test Scores | National Avg. |
| Downsville, WI | 206 | 25% | 47.9% |
| Pleasant Plains, AR | 205 | 20% | 59.4% |
| Port Alsworth, AK | 207 | 75% | 56.3% |
| Fordville, ND | 205 | 30% | 37.5% |
| Darlington, PA | 205 | 52% | 8.3% |
| Cosby, MO | 206 | 65% | 34.4% |
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