| Index | Cosmopolis | Washington | National |
| Average Test Scores | 54% | 54% | 48% |
| Student/Teacher ratio | 12:1 | 20:1 | 16:1 |
| Total public schools | 2 | 1,991 | 79,221 |
| Total private schools | n/a | 548 | 24,874 |
| Total post-secondary schools | n/a | 147 | 7,963 |
| Index | Cosmopolis | Washington | National |
| Completed 8th grade | 88.9% | 87.5% | 84.3% |
| Completed high school | 88.9% | 86.6% | 83.0% |
| Completed some college | 56.8% | 67.7% | 59.4% |
| Completed associate degree | 22.7% | 43.3% | 38.5% |
| Completed bachelors | 13.2% | 33.6% | 30.3% |
| Completed masters | 3.9% | 12.3% | 11.5% |
| Completed professional degree | 0.3% | 3.6% | 3.3% |
| Completed doctorate | 0.3% | 1.5% | 1.3% |
There are a total of 2 public schools, n/a private schools and n/a post-secondary schools in Cosmopolis. Using the proficiency score averages, the average test scores for Cosmopolis, WA schools is 54%. The average student to teacher ratio is 12:1. In Cosmopolis, WA, an average of 88.9% of students have completed 8th grade and an average of 88.9% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Satsop, WA | 638 | 60% | 25.0% |
| Montesano, WA | 4,002 | 59% | 22.9% |
| Aberdeen, WA | 16,571 | 37% | 23.1% |
| Hoquiam, WA | 8,570 | 35% | 26.3% |
| Cosmopolis, WA | 1,968 | 54% | 11.5% |
| City | Population | Avg. Test Scores | National Avg. |
| Grayling, MI | 1,969 | 49% | 1.3% |
| Fishkill, NY | 1,967 | 59% | 22.6% |
| Laton, CA | 1,967 | 25% | 48.6% |
| Stewart Manor, NY | 1,966 | 70% | 44.8% |
| Hagerstown, IN | 1,970 | 49% | 1.6% |
| Cosmopolis, WA | 1,968 | 54% | 11.5% |
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