| 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% |
| Port Monmouth, NJ | 3,660 | 51% | 5.2% |
| Spencerport, NY | 3,656 | 59% | 22.0% |
| Waukon, IA | 3,663 | 76% | 58.0% |
| Harrington, DE | 3,658 | 51% | 6.3% |
Here are the best places to live in Delaware
Check out the 10 safest cities in Delaware
These are the largest cities in Delaware
Check out the 10 most dangerous cities in Delaware