| Rank | County | Housing Units |
|---|---|---|
| 1 | Montgomery County, Maryland | 377,575 |
| 2 | Baltimore County, Maryland | 336,939 |
| 3 | Prince Georges County, Maryland | 329,794 |
| 4 | Baltimore city, Maryland | 296,450 |
| 5 | Anne Arundel County, Maryland | 214,520 |
| 6 | Howard County, Maryland | 111,200 |
| 7 | Harford County, Maryland | 96,024 |
| 8 | Frederick County, Maryland | 91,258 |
| 9 | Carroll County, Maryland | 62,584 |
| 10 | Washington County, Maryland | 60,819 |
| 11 | Worcester County, Maryland | 55,886 |
| 12 | Charles County, Maryland | 55,810 |
| 13 | St Marys County, Maryland | 41,600 |
| 14 | Wicomico County, Maryland | 41,332 |
| 15 | Cecil County, Maryland | 41,288 |
| 16 | Calvert County, Maryland | 34,148 |
| 17 | Allegany County, Maryland | 33,358 |
| 18 | Queen Annes County, Maryland | 20,303 |
| 19 | Talbot County, Maryland | 19,645 |
| 20 | Garrett County, Maryland | 18,931 |
| 21 | Dorchester County, Maryland | 16,574 |
| 22 | Caroline County, Maryland | 13,469 |
| 23 | Somerset County, Maryland | 11,237 |
| 24 | Kent County, Maryland | 10,606 |
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