| Rank | County | Percentage with High School Diploma | 
|---|---|---|
| 1 | Howard County, Maryland | 94.9% | 
| 2 | Calvert County, Maryland | 92.1% | 
| 3 | Frederick County, Maryland | 91.5% | 
| 4 | Harford County, Maryland | 91.3% | 
| 5 | Montgomery County, Maryland | 91.1% | 
| 6 | Charles County, Maryland | 90.6% | 
| 7 | Anne Arundel County, Maryland | 90.4% | 
| 8 | Queen Annes County, Maryland | 90.3% | 
| 9 | Carroll County, Maryland | 90.3% | 
| 10 | St Marys County, Maryland | 89.8% | 
| 11 | Baltimore County, Maryland | 89.2% | 
| 12 | Talbot County, Maryland | 88.8% | 
| 13 | Worcester County, Maryland | 88.7% | 
| 14 | Cecil County, Maryland | 86.9% | 
| 15 | Allegany County, Maryland | 86.4% | 
| 16 | Prince Georges County, Maryland | 85.8% | 
| 17 | Kent County, Maryland | 85.5% | 
| 18 | Wicomico County, Maryland | 85.4% | 
| 19 | Garrett County, Maryland | 84.7% | 
| 20 | Washington County, Maryland | 84.2% | 
| 21 | Caroline County, Maryland | 82.2% | 
| 22 | Dorchester County, Maryland | 82.2% | 
| 23 | Somerset County, Maryland | 81.6% | 
| 24 | Baltimore city, Maryland | 78.5% | 
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