| 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 |
| 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 | 948 | 77% | 60.4% |
| Felton, DE | 1,191 | 56% | 17.0% |
| Milton, DE | 2,993 | 55% | 13.9% |
| Milford, DE | 11,463 | 47% | 1.3% |
| Woodside, DE | 207 | 46% | 5.2% |
| Harrington, DE | 3,658 | 51% | 6.3% |
| City | Population | Avg. Test Scores | National Avg. |
| Kelseyville, CA | 3,657 | 30% | 38.5% |
| Fairbury, NE | 3,657 | 43% | 10.9% |
| Spencerport, NY | 3,656 | 59% | 22.0% |
| Port Monmouth, NJ | 3,660 | 51% | 5.2% |
| Waukon, IA | 3,663 | 76% | 58.0% |
| Harrington, DE | 3,658 | 51% | 6.3% |
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