Largest Counties in Maryland

Rank County Population County Seat Established Area (km2) Density
1 Montgomery County 1,004,698 Rockville 1776 1,313 765.19
2 Prince George’s County 881,127 Upper Marlboro 1696 1,290 683.04
3 Baltimore County 817,444 Towson 1659 1,766 462.88
4 Baltimore City 621,331 Baltimore City 1851 238 2,610.63
5 Anne Arundel County 550,477 Annapolis 1650 1,523 361.44
6 Howard County 299,419 Ellicott City 1851 658 455.04
7 Harford County 248,611 Bel Air 1773 1,365 182.13
8 Frederick County 239,571 Frederick 1748 1,728 138.64
9 Carroll County 167,206 Westminster 1837 1,171 142.79
10 Charles County 150,581 La Plata 1658 1,665 90.44
11 Washington County 149,169 Hagerstown 1776 1,212 123.08
12 Saint Mary’s County 108,976 Leonardtown 1637 1,582 68.88
13 Cecil County 101,685 Elkton 1672 1,083 93.89
14 Wicomico County 100,636 Salisbury 1867 1,036 97.14
15 Calvert County 89,617 Prince Frederick 1654 894 100.24
16 Allegany County 74,001 Cumberland 1789 1,114 66.43
17 Worcester County 51,567 Snow Hill 1742 1,800 28.65
18 Queen Anne’s County 48,584 Centreville 1706 1,321 36.78
19 Talbot County 38,087 Easton 1662 1,235 30.84
20 Caroline County 32,707 Denton 1773 844 38.75
21 Dorchester County 32,540 Cambridge 1668 1,399 23.26
22 Garrett County 29,843 Oakland 1872 1,699 17.57
23 Somerset County 26,242 Princess Anne 1666 1,582 16.59
24 Kent County 20,180 Chestertown 1642 1,072 18.82

Largest Counties in Maryland

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