| Rank | County | Households |
|---|---|---|
| 1 | Montgomery County, Maryland | 355,434 |
| 2 | Baltimore County, Maryland | 315,127 |
| 3 | Prince Georges County, Maryland | 302,091 |
| 4 | Baltimore city, Maryland | 238,959 |
| 5 | Anne Arundel County, Maryland | 197,348 |
| 6 | Howard County, Maryland | 103,547 |
| 7 | Harford County, Maryland | 89,260 |
| 8 | Frederick County, Maryland | 85,048 |
| 9 | Carroll County, Maryland | 59,314 |
| 10 | Washington County, Maryland | 55,485 |
| 11 | Charles County, Maryland | 50,305 |
| 12 | St Marys County, Maryland | 36,662 |
| 13 | Wicomico County, Maryland | 36,406 |
| 14 | Cecil County, Maryland | 35,943 |
| 15 | Calvert County, Maryland | 30,381 |
| 16 | Allegany County, Maryland | 28,596 |
| 17 | Worcester County, Maryland | 21,785 |
| 18 | Queen Annes County, Maryland | 17,189 |
| 19 | Talbot County, Maryland | 15,539 |
| 20 | Dorchester County, Maryland | 13,528 |
| 21 | Garrett County, Maryland | 12,410 |
| 22 | Caroline County, Maryland | 11,842 |
| 23 | Somerset County, Maryland | 8,573 |
| 24 | Kent County, Maryland | 7,605 |
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