| Index | Delmar | Delaware | National |
| Average Test Scores | 45% | 44% | 48% |
| Student/Teacher ratio | 17:1 | 16:1 | 16:1 |
| Total public schools | 2 | 191 | 79,221 |
| Total private schools | 1 | 129 | 24,874 |
| Total post-secondary schools | n/a | 20 | 7,963 |
| Index | Delmar | Delaware | National |
| Completed 8th grade | 81.0% | 86.3% | 84.3% |
| Completed high school | 79.8% | 85.3% | 83.0% |
| Completed some college | 42.5% | 57.7% | 59.4% |
| Completed associate degree | 21.1% | 38.2% | 38.5% |
| Completed bachelors | 11.9% | 30.5% | 30.3% |
| Completed masters | 4.3% | 12.4% | 11.5% |
| Completed professional degree | 1.4% | 3.5% | 3.3% |
| Completed doctorate | 0.0% | 1.7% | 1.3% |
There are a total of 2 public schools, 1 private schools and n/a post-secondary schools in Delmar. Using the proficiency score averages, the average test scores for Delmar, DE schools is 45%. The average student to teacher ratio is 17:1. In Delmar, DE, an average of 81.0% of students have completed 8th grade and an average of 79.8% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Millsboro, DE | 4,448 | 60% | 25.3% |
| Mardela Springs, MD | 487 | 55% | 15.1% |
| Delmar, MD | 3,321 | 48% | 1.0% |
| Willards, MD | 1,034 | 47% | 2.1% |
| Hebron, MD | 1,019 | 47% | 2.1% |
| Delmar, DE | 2,153 | 45% | 6.8% |
| City | Population | Avg. Test Scores | National Avg. |
| Wellington, TX | 2,153 | 52% | 8.7% |
| Cave Junction, OR | 2,153 | 32% | 33.7% |
| Ault, CO | 2,153 | 35% | 28.1% |
| Leechburg, PA | 2,154 | 61% | 26.6% |
| Leetonia, OH | 2,151 | 57% | 19.1% |
| Delmar, DE | 2,153 | 45% | 6.8% |
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