For the long story of why we have new state districts see : Redistricting
‘Special Joint Committee on Redistricting
The Special Joint Committee on Redistricting studied and proposed a new division of the Commonwealth into 9 Congressional districts under the United States Constitution, 40 Senatorial and 8 Councillor districts under Section 2 of Article CI of the Amendments to the Constitution, as amended, and 160 Representative districts under section 1 of said Article CI. Governor Baker signed the state legislative districts into law on November 4th, 2021 and the Congressional and Councillor districts into law on November 22nd, 2021. These districts will go into effect for the 2022 elections.’
‘What is Redistricting?
After the release of the U.S. Decennial Census, Massachusetts is constitutionally mandated to change its House, Senate, Governor’s Council and Congressional district boundaries to accommodate shifts in population and provide equal representation to its citizens. The information below will provide a historical perspective of redistricting in Massachusetts from the early days of paper maps to today’s more sophisticated Geographic Information Systems.’
To find your new district you can use: https://malegislature.gov/Redistricting/FindYourNewDistrict