Your Voice in Government
Legislators
Who Represents Chelmsford
Chelmsford is split among three state House districts, so the representative for your street depends on your precinct. One state senator covers the whole town. In Washington, all of Chelmsford is represented by one member of Congress and the Commonwealth’s two U.S. senators.
State Senator
Third Middlesex District · Democrat
Michael J. Barrett
Senator Mike Barrett has represented the Third Middlesex District in the Massachusetts Senate since 2013, and Chelmsford is one of its communities. He is known on Beacon Hill for work on climate and energy policy. All of Chelmsford votes for this one Senate seat.
State Representatives
Three House districts divide Chelmsford by precinct. Use the lookup tools below to find which one covers your address.
2nd Middlesex District · Democrat
Jim Arciero
14th Middlesex District · Democrat
Simon Cataldo
16th Middlesex District · Democrat
Rodney Elliott
Find Your Exact Legislator
Because Chelmsford is split three ways, look up your own address to find your representative:
In Washington
All of Chelmsford sits in the 3rd Congressional District, represented by U.S. Representative Lori Trahan, a Democrat who has held the seat since 2019. Massachusetts is represented in the U.S. Senate by Elizabeth Warren, the senior senator, and Edward J. Markey, the junior senator. Both were first elected to the Senate in 2013.
Sources
Massachusetts Legislature (malegislature.gov). Verified July 2026.
Open States (Plural). Verified July 2026.
What this seat decides
The state and federal seats
Your State Representative and your State Senator. State law: the driving age, the minimum wage, the bottle deposit, and Chapter 70, the formula that decides how much state money your schools get. They also carry a home rule petition to the State House when your town votes for something state law does not yet allow it to do.
Your member of Congress and your two US Senators. Federal law and federal money, and help with a federal agency like Social Security, the VA, or immigration when someone in your family needs it. They also nominate candidates to the US service academies.
Knowing who represents you is the first step. Learn how to write to them so it lands.