| Index | Cobb Island | Maryland | National |
| Average Test Scores | n/a | 40% | 48% |
| Student/Teacher ratio | n/a | 16:1 | 16:1 |
| Total public schools | n/a | 1,163 | 79,221 |
| Total private schools | n/a | 674 | 24,874 |
| Total post-secondary schools | n/a | 112 | 7,963 |
| Index | Cobb Island | Maryland | National |
| Completed 8th grade | 91.2% | 87.5% | 84.3% |
| Completed high school | 91.2% | 86.5% | 83.0% |
| Completed some college | 39.0% | 64.2% | 59.4% |
| Completed associate degree | 12.4% | 44.8% | 38.5% |
| Completed bachelors | 9.2% | 38.4% | 30.3% |
| Completed masters | 5.8% | 17.7% | 11.5% |
| Completed professional degree | 1.4% | 5.5% | 3.3% |
| Completed doctorate | 0.0% | 2.5% | 1.3% |
There are a total of n/a public schools, n/a private schools and n/a post-secondary schools in Cobb Island. Using the proficiency score averages, the average test scores for Cobb Island, MD schools is n/a. The average student to teacher ratio is n/a. In Cobb Island, MD, an average of 91.2% of students have completed 8th grade and an average of 91.2% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Dahlgren, VA | 3,528 | 85% | 76.0% |
| Montross, VA | 553 | 76% | 58.9% |
| Colonial Beach, VA | 3,591 | 75% | 56.6% |
| Leonardtown, MD | 3,795 | 60% | 24.0% |
| Mechanicsville, MD | 1,724 | 55% | 15.0% |
| Cobb Island, MD | 1,119 | n/a |
| City | Population | Avg. Test Scores | National Avg. |
| Parkers Prairie, MN | 1,119 | 60% | 24.0% |
| Wilson, AR | 1,118 | 36% | 24.5% |
| Williamsburg, PA | 1,118 | 52% | 8.3% |
| Sheridan, CA | 1,120 | 40% | 16.7% |
| Goreville, IL | 1,120 | 32% | 33.3% |
| Cobb Island, MD | 1,119 | n/a |
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