Massachusetts Counties by Population (2025)

There are 14 counties in Massachusetts.

Middlesex County is the largest county in the state, with a population of 1,638,268. The most recent census shows that its population has increased by 0.01% since the previous census.

A number of other Massachusetts counties also boast relatively large populations for their state, though not able to match the density of Middlesex County:

• Worcester County : 874,852
• Essex County : 817,269

Massachusetts Counties with the Fewest Residents

The smallest county in Massachusetts is Nantucket County, with a population of just 14,446. This total represents a increase of 0.0% since the last census count was performed.

Other small counties include:

• Dukes County : 20,533
• Franklin County : 70,518
• Berkshire County : 125,360

Massachusetts Counties with Rapid Growth

Hampshire County, with its sizeable population of 162,470, has shown the largest population growth, with an increase of 0.1% since the last census.

Worcester County has also had relatively high population growth of 0.02% with 874,852 residents.

On the other hand, Suffolk County has had the largest decrease in population, with its 767,651 current residents totalling 0.0% less than the previous census.