| Rank | County | Population (2012) |
|---|---|---|
| 1 | Montgomery County, Maryland | 1,004,709 |
| 2 | Prince Georges County, Maryland | 881,138 |
| 3 | Baltimore County, Maryland | 817,455 |
| 4 | Baltimore city, Maryland | 621,342 |
| 5 | Anne Arundel County, Maryland | 550,488 |
| 6 | Howard County, Maryland | 299,430 |
| 7 | Harford County, Maryland | 248,622 |
| 8 | Frederick County, Maryland | 239,582 |
| 9 | Carroll County, Maryland | 167,217 |
| 10 | Charles County, Maryland | 150,592 |
| 11 | Washington County, Maryland | 149,180 |
| 12 | St Marys County, Maryland | 108,987 |
| 13 | Cecil County, Maryland | 101,696 |
| 14 | Wicomico County, Maryland | 100,647 |
| 15 | Calvert County, Maryland | 89,628 |
| 16 | Allegany County, Maryland | 74,012 |
| 17 | Worcester County, Maryland | 51,578 |
| 18 | Queen Annes County, Maryland | 48,595 |
| 19 | Talbot County, Maryland | 38,098 |
| 20 | Caroline County, Maryland | 32,718 |
| 21 | Dorchester County, Maryland | 32,551 |
| 22 | Garrett County, Maryland | 29,854 |
| 23 | Somerset County, Maryland | 26,253 |
| 24 | Kent County, Maryland | 20,191 |
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