Massachusetts counties and county equivalents

These are current canonical geography records. Historical boundaries and election reporting units can differ; consult each area's caveats.

• Barnstable County

  FIPS 25001

• Berkshire County

  FIPS 25003

• Bristol County

  FIPS 25005

• Dukes County

  FIPS 25007

• Essex County

  FIPS 25009

• Franklin County

  FIPS 25011

• Hampden County

  FIPS 25013

• Hampshire County

  FIPS 25015

• Middlesex County

  FIPS 25017

• Nantucket County

  FIPS 25019

• Norfolk County

  FIPS 25021

• Plymouth County

  FIPS 25023

• Suffolk County

  FIPS 25025

• Worcester County

  FIPS 25027