| Rank | County | Percentage with High School Diploma |
|---|---|---|
| 1 | Middlesex County, Connecticut | 93.0% |
| 2 | Tolland County, Connecticut | 92.4% |
| 3 | Litchfield County, Connecticut | 91.3% |
| 4 | New London County, Connecticut | 90.1% |
| 5 | Fairfield County, Connecticut | 88.4% |
| 6 | New Haven County, Connecticut | 87.8% |
| 7 | Hartford County, Connecticut | 87.3% |
| 8 | Windham County, Connecticut | 85.5% |
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