Mattapoisett is represented in the Massachusetts House of Representatives by William Straus, as a part of the Tenth Bristol district, and in the Massachusetts Senate by Mark Montigny, as part of the Second Bristol and Plymouth district.
 In the US House of Representatives, Mattapoisett is a part of Massachusetts's 9th congressional district, and is currently represented by William R. Keating.
 In the US Senate is Elizabeth Warren and the junior senator is Ed Markey.

Mattapoisett uses the open town meeting form of government, led by a board of selectmen.
 The town hall is located on Main Street, between Route 6 and the harbor.
The town has its own highly educated full-time police department and on-call fire department, both headquartered on Route 6.
 The Mattapoisett Police Department runs the emergency medical system (EMS) for the town with it being one of the last towns among the Commonwealth to have a police based EMS system.
All police officers are required to be at minimum EMT-Basics while some members of the police are EMT-Paramedics.
The EMS also has civilian EMT-Paramedic members who reside in the community.
The Mattapoisett Free Public Library, located on Barstow Street, is a member of the SAILS Library Network, the Southeastern Massachusetts Library System (SEMLS), and the Massachusetts Library Internet Network (MLIN).
Mattapoisett is represented in the Massachusetts House of Representatives by William Straus, as a part of the Tenth Bristol district, and in the Massachusetts Senate by Mark Montigny, as part of the Second Bristol and Plymouth district.  In the US House of Representatives, Mattapoisett is a part of Massachusetts's 9th congressional district, and is currently represented by William R. Keating.  In the US Senate is Elizabeth Warren and the junior senator is Ed Markey.
Mattapoisett uses the open town meeting form of government, led by a board of selectmen.  The town hall is located on Main Street, between Route 6 and the harbor. The town has its own highly educated full-time police department and on-call fire department, both headquartered on Route 6.  The Mattapoisett Police Department runs the emergency medical system (EMS) for the town with it being one of the last towns among the Commonwealth to have a police based EMS system. All police officers are required to be at minimum EMT-Basics while some members of the police are EMT-Paramedics. The EMS also has civilian EMT-Paramedic members who reside in the community. The Mattapoisett Free Public Library, located on Barstow Street, is a member of the SAILS Library Network, the Southeastern Massachusetts Library System (SEMLS), and the Massachusetts Library Internet Network (MLIN).
Mattapoisett, Massachusetts