| Index | Millsboro | Delaware | National |
| Average Test Scores | 60% | 44% | 48% |
| Student/Teacher ratio | 15:1 | 16:1 | 16:1 |
| Total public schools | 3 | 191 | 79,221 |
| Total private schools | n/a | 129 | 24,874 |
| Total post-secondary schools | n/a | 20 | 7,963 |
| Index | Millsboro | Delaware | National |
| Completed 8th grade | 81.6% | 86.3% | 84.3% |
| Completed high school | 80.0% | 85.3% | 83.0% |
| Completed some college | 49.7% | 57.7% | 59.4% |
| Completed associate degree | 31.0% | 38.2% | 38.5% |
| Completed bachelors | 22.0% | 30.5% | 30.3% |
| Completed masters | 8.3% | 12.4% | 11.5% |
| Completed professional degree | 2.2% | 3.5% | 3.3% |
| Completed doctorate | 0.0% | 1.7% | 1.3% |
There are a total of 3 public schools, n/a private schools and n/a post-secondary schools in Millsboro. Using the proficiency score averages, the average test scores for Millsboro, DE schools is 60%. The average student to teacher ratio is 15:1. In Millsboro, DE, an average of 81.6% of students have completed 8th grade and an average of 80.0% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Ocean View, DE | 2,637 | 78% | 62.5% |
| Rehoboth Beach, DE | 1,588 | 74% | 53.1% |
| Selbyville, DE | 2,520 | 65% | 34.7% |
| Milton, DE | 2,993 | 55% | 13.9% |
| Lewes, DE | 3,266 | 53% | 9.6% |
| Millsboro, DE | 4,448 | 60% | 25.3% |
| City | Population | Avg. Test Scores | National Avg. |
| Saukville, WI | 4,448 | 75% | 55.2% |
| Florence, MS | 4,446 | 50% | 5.0% |
| Sullivan, IL | 4,450 | 29% | 39.2% |
| Montoursville, PA | 4,452 | 70% | 45.6% |
| Winfield, AL | 4,443 | 61% | 26.7% |
| Millsboro, DE | 4,448 | 60% | 25.3% |
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