| Index | Harrington | Delaware | National |
| Average Test Scores | 51% | 44% | 48% |
| Student/Teacher ratio | 15:1 | 16:1 | 16:1 |
| Total public schools | 2 | 191 | 79,221 |
| Total private schools | n/a | 129 | 24,874 |
| Total post-secondary schools | n/a | 20 | 7,963 |


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| Index | Harrington | Delaware | National |
| Completed 8th grade | 86.6% | 86.3% | 84.3% |
| Completed high school | 84.7% | 85.3% | 83.0% |
| Completed some college | 53.9% | 57.7% | 59.4% |
| Completed associate degree | 26.2% | 38.2% | 38.5% |
| Completed bachelors | 13.9% | 30.5% | 30.3% |
| Completed masters | 3.5% | 12.4% | 11.5% |
| Completed professional degree | 1.7% | 3.5% | 3.3% |
| Completed doctorate | 1.7% | 1.7% | 1.3% |
There are a total of 2 public schools, n/a private schools and n/a post-secondary schools in Harrington. Using the proficiency score averages, the average test scores for Harrington, DE schools is 51%. The average student to teacher ratio is 15:1. In Harrington, DE, an average of 86.6% of students have completed 8th grade and an average of 84.7% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Frederica, DE | 980 | 77% | 60.4% |
| Felton, DE | 1,237 | 56% | 17.0% |
| Milton, DE | 3,090 | 55% | 13.9% |
| Milford, DE | 11,721 | 47% | 1.3% |
| Woodside, DE | 212 | 46% | 5.2% |
| Harrington, DE | 3,741 | 51% | 6.3% |
| City | Population | Avg. Test Scores | National Avg. |
| Port Monmouth, NJ | 3,741 | 51% | 5.2% |
| Gaylord, MI | 3,741 | 54% | 12.5% |
| Aledo, IL | 3,742 | 29% | 39.6% |
| Strathmore, CA | 3,742 | 40% | 16.9% |
| Paoli, IN | 3,743 | 44% | 7.8% |
| Harrington, DE | 3,741 | 51% | 6.3% |