Massachusetts Counties by Population (2025)

There are 14 counties in Massachusetts.

Middlesex County is the largest county in the state, with a population of 1,692,980. The most recent census shows that its population has increased by 0.04% 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 : 889,683
• Essex County : 831,679

Massachusetts Counties with the Fewest Residents

The smallest county in Massachusetts is Nantucket County , with a population of just 14,806. This total represents a increase of 0.0% since the last census count was performed.

Other small counties include:

• Dukes County : 21,243
• Franklin County : 70,882
• Berkshire County : 128,589

Massachusetts Counties with Rapid Growth

Hampshire County , with its sizeable population of 165,112, has shown the largest population growth, with an increase of 0.1% since the last census.

Middlesex County has also had relatively high population growth of 0.04% with 1,692,980 residents.

On the other hand, Berkshire County has had the largest decrease in population, with its 128,589 current residents totalling 0.0% less than the previous census.