Largest Counties in Massachusetts

Rank County Population County Seat Established Area (km2) Density
1 Middlesex County 1,503,074 Lowell 1643 2,134 704.35
2 Worcester County 798,541 Worcester 1731 3,919 203.76
3 Essex County 743,148 Salem 1643 1,290 576.08
4 Suffolk County 722,012 Boston 1643 150 4,813.41
5 Norfolk County 670,839 Dedham 1793 1,036 647.53
6 Bristol County 548,274 Taunton 1685 1,440 380.75
7 Plymouth County 494,908 Brockton 1685 1,712 289.08
8 Hampden County 463,479 Springfield 1812 1,601 289.49
9 Barnstable County 215,877 Barnstable 1685 1,026 210.41
10 Hampshire County 158,069 Northampton 1662 1,370 115.38
11 Berkshire County 131,208 Pittsfield 1761 2,411 54.42
12 Franklin County 71,361 Greenfield 1811 1,818 39.25
13 Dukes County 16,524 Edgartown 1695 269 61.43
14 Nantucket County 10,161 Nantucket 1695 124 81.94

Largest Counties in Massachusetts

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