| 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% | 
© 2025 www.biggestuscities.com, All Rights Reserved • Privacy Policy • Last updated: Jan 2, 2025