| Rank | County | Percentage of Residents Living In Multi-Unit Buildings | 
|---|---|---|
| 1 | Worcester County, Maryland | 46.3% | 
| 2 | Montgomery County, Maryland | 32.9% | 
| 3 | Baltimore city, Maryland | 32.8% | 
| 4 | Prince Georges County, Maryland | 32.4% | 
| 5 | Baltimore County, Maryland | 28.2% | 
| 6 | Howard County, Maryland | 24.9% | 
| 7 | Washington County, Maryland | 19.9% | 
| 8 | Allegany County, Maryland | 19.9% | 
| 9 | Wicomico County, Maryland | 19.2% | 
| 10 | Anne Arundel County, Maryland | 17.3% | 
| 11 | Frederick County, Maryland | 16.6% | 
| 12 | Harford County, Maryland | 15.1% | 
| 13 | Somerset County, Maryland | 14.4% | 
| 14 | Dorchester County, Maryland | 14.3% | 
| 15 | Cecil County, Maryland | 12.9% | 
| 16 | St Marys County, Maryland | 12.9% | 
| 17 | Talbot County, Maryland | 12.7% | 
| 18 | Kent County, Maryland | 11.9% | 
| 19 | Carroll County, Maryland | 11.7% | 
| 20 | Caroline County, Maryland | 10.1% | 
| 21 | Garrett County, Maryland | 9.9% | 
| 22 | Charles County, Maryland | 9.9% | 
| 23 | Queen Annes County, Maryland | 6.0% | 
| 24 | Calvert County, Maryland | 5.5% | 
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