| Index | Hartly | Delaware | National |
| Average Test Scores | 62% | 44% | 48% |
| Student/Teacher ratio | n/a | 16:1 | 16:1 |
| Total public schools | n/a | 191 | 79,221 |
| Total private schools | n/a | 129 | 24,874 |
| Total post-secondary schools | n/a | 20 | 7,963 |
| Index | Hartly | Delaware | National |
| Completed 8th grade | 77.4% | 86.3% | 84.3% |
| Completed high school | 77.4% | 85.3% | 83.0% |
| Completed some college | 61.3% | 57.7% | 59.4% |
| Completed associate degree | 48.4% | 38.2% | 38.5% |
| Completed bachelors | 38.7% | 30.5% | 30.3% |
| Completed masters | 12.9% | 12.4% | 11.5% |
| Completed professional degree | 3.2% | 3.5% | 3.3% |
| Completed doctorate | 0.0% | 1.7% | 1.3% |
There are a total of n/a public schools, n/a private schools and n/a post-secondary schools in Hartly. Using the proficiency score averages, the average test scores for Hartly, DE schools is 62%. The average student to teacher ratio is n/a. In Hartly, DE, an average of 77.4% of students have completed 8th grade and an average of 77.4% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Frederica, DE | 948 | 77% | 60.4% |
| Church Hill, MD | 866 | 57% | 18.8% |
| Felton, DE | 1,191 | 56% | 17.0% |
| Clayton, DE | 3,393 | 51% | 7.0% |
| Smyrna, DE | 11,694 | 50% | 4.3% |
| Hartly, DE | 167 | 62% | 29.2% |
| City | Population | Avg. Test Scores | National Avg. |
| Richey, MT | 167 | 50% | 4.2% |
| Port Wing, WI | 167 | 48% | 1.0% |
| Elgin, AZ | 168 | 40% | 17.7% |
| Campbell, MN | 166 | 43% | 11.5% |
| Yoder, WY | 166 | 72% | 49.0% |
| Hartly, DE | 167 | 62% | 29.2% |
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