| Index | New Castle | Delaware | National |
| Average Test Scores | 30% | 44% | 48% |
| Student/Teacher ratio | 16:1 | 16:1 | 16:1 |
| Total public schools | 13 | 191 | 79,221 |
| Total private schools | 5 | 129 | 24,874 |
| Total post-secondary schools | 1 | 20 | 7,963 |
| Index | New Castle | Delaware | National |
| Completed 8th grade | 88.1% | 86.3% | 84.3% |
| Completed high school | 86.8% | 85.3% | 83.0% |
| Completed some college | 54.3% | 57.7% | 59.4% |
| Completed associate degree | 33.1% | 38.2% | 38.5% |
| Completed bachelors | 26.0% | 30.5% | 30.3% |
| Completed masters | 12.2% | 12.4% | 11.5% |
| Completed professional degree | 2.8% | 3.5% | 3.3% |
| Completed doctorate | 1.4% | 1.7% | 1.3% |
There are a total of 13 public schools, 5 private schools and 1 post-secondary schools in New Castle. Using the proficiency score averages, the average test scores for New Castle, DE schools is 30%. The average student to teacher ratio is 16:1. In New Castle, DE, an average of 88.1% of students have completed 8th grade and an average of 86.8% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Village Green-Green Ridge, PA | 8,961 | 77% | 60.4% |
| Kennett Square, PA | 6,386 | 75% | 57.1% |
| Brookhaven, PA | 8,262 | 72% | 50.0% |
| Beckett, NJ | 5,281 | 70% | 45.3% |
| West Grove, PA | 2,904 | 69% | 44.0% |
| New Castle, DE | 5,485 | 30% | 36.9% |
| City | Population | Avg. Test Scores | National Avg. |
| Uhrichsville, OH | 5,483 | 57% | 18.1% |
| Wadesboro, NC | 5,482 | 25% | 47.7% |
| Kittery, ME | 5,489 | 53% | 9.9% |
| Evansville, WI | 5,489 | 41% | 13.9% |
| Macon, MO | 5,481 | 54% | 11.5% |
| New Castle, DE | 5,485 | 30% | 36.9% |
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