| Rank | County | Land Area |
|---|---|---|
| 1 | Frederick County, Maryland | 660.2 |
| 2 | Garrett County, Maryland | 647.1 |
| 3 | Baltimore County, Maryland | 598.3 |
| 4 | Dorchester County, Maryland | 540.8 |
| 5 | Montgomery County, Maryland | 491.2 |
| 6 | Prince Georges County, Maryland | 482.7 |
| 7 | Worcester County, Maryland | 468.3 |
| 8 | Washington County, Maryland | 457.8 |
| 9 | Charles County, Maryland | 457.8 |
| 10 | Carroll County, Maryland | 447.6 |
| 11 | Harford County, Maryland | 437.1 |
| 12 | Allegany County, Maryland | 424.2 |
| 13 | Anne Arundel County, Maryland | 414.9 |
| 14 | Wicomico County, Maryland | 374.4 |
| 15 | Queen Annes County, Maryland | 371.9 |
| 16 | St Marys County, Maryland | 357.2 |
| 17 | Cecil County, Maryland | 346.3 |
| 18 | Somerset County, Maryland | 319.7 |
| 19 | Caroline County, Maryland | 319.4 |
| 20 | Kent County, Maryland | 277.0 |
| 21 | Talbot County, Maryland | 268.5 |
| 22 | Howard County, Maryland | 250.7 |
| 23 | Calvert County, Maryland | 213.2 |
| 24 | Baltimore city, Maryland | 80.9 |
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