| Rank | County | Percentage with High School Diploma |
|---|---|---|
| 1 | Yavapai County, Arizona | 89.8% |
| 2 | Pima County, Arizona | 87.0% |
| 3 | Coconino County, Arizona | 86.8% |
| 4 | Greenlee County, Arizona | 86.4% |
| 5 | Maricopa County, Arizona | 85.8% |
| 6 | Cochise County, Arizona | 85.0% |
| 7 | Pinal County, Arizona | 84.5% |
| 8 | Gila County, Arizona | 84.1% |
| 9 | Mohave County, Arizona | 83.9% |
| 10 | Graham County, Arizona | 82.6% |
| 11 | Navajo County, Arizona | 80.4% |
| 12 | La Paz County, Arizona | 75.4% |
| 13 | Apache County, Arizona | 73.1% |
| 14 | Yuma County, Arizona | 71.9% |
| 15 | Santa Cruz County, Arizona | 71.2% |
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