| Rank | County | Percentage with High School Diploma |
|---|---|---|
| 1 | Hunterdon County, New Jersey | 94.0% |
| 2 | Sussex County, New Jersey | 93.4% |
| 3 | Morris County, New Jersey | 93.1% |
| 4 | Somerset County, New Jersey | 93.0% |
| 5 | Monmouth County, New Jersey | 91.6% |
| 6 | Burlington County, New Jersey | 91.4% |
| 7 | Bergen County, New Jersey | 91.0% |
| 8 | Gloucester County, New Jersey | 90.0% |
| 9 | Warren County, New Jersey | 89.5% |
| 10 | Ocean County, New Jersey | 89.2% |
| 11 | Cape May County, New Jersey | 88.9% |
| 12 | Middlesex County, New Jersey | 88.6% |
| 13 | Mercer County, New Jersey | 87.1% |
| 14 | Camden County, New Jersey | 85.9% |
| 15 | Salem County, New Jersey | 85.7% |
| 16 | Union County, New Jersey | 85.0% |
| 17 | Atlantic County, New Jersey | 84.2% |
| 18 | Essex County, New Jersey | 82.4% |
| 19 | Passaic County, New Jersey | 81.7% |
| 20 | Hudson County, New Jersey | 81.1% |
| 21 | Cumberland County, New Jersey | 76.7% |
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