| Rank | County | Percentage of Foreign Born Residents | 
|---|---|---|
| 1 | Montgomery County, Maryland | 31.4% | 
| 2 | Prince Georges County, Maryland | 19.8% | 
| 3 | Howard County, Maryland | 17.6% | 
| 4 | Baltimore County, Maryland | 10.7% | 
| 5 | Frederick County, Maryland | 9.2% | 
| 6 | Anne Arundel County, Maryland | 7.7% | 
| 7 | Baltimore city, Maryland | 7.2% | 
| 8 | Wicomico County, Maryland | 6.9% | 
| 9 | Charles County, Maryland | 5.4% | 
| 10 | Talbot County, Maryland | 4.9% | 
| 11 | Harford County, Maryland | 4.8% | 
| 12 | Caroline County, Maryland | 4.8% | 
| 13 | Washington County, Maryland | 4.5% | 
| 14 | Worcester County, Maryland | 4.3% | 
| 15 | Somerset County, Maryland | 4.0% | 
| 16 | St Marys County, Maryland | 3.7% | 
| 17 | Kent County, Maryland | 3.6% | 
| 18 | Carroll County, Maryland | 3.6% | 
| 19 | Calvert County, Maryland | 3.5% | 
| 20 | Dorchester County, Maryland | 3.4% | 
| 21 | Queen Annes County, Maryland | 3.4% | 
| 22 | Cecil County, Maryland | 3.1% | 
| 23 | Allegany County, Maryland | 1.8% | 
| 24 | Garrett County, Maryland | 0.9% | 
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