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MassGIS Data: Massachusetts House Legislative Districts (2012)

March 2022

*** For the latest data see the 2021 state House districts.

This layer shows the state House of Representative district boundaries for Massachusetts that were used in elections beginning in 2012 and those before 2022. Voting resources can be found on the Secretary of the Commonwealth’s website.

Table of Contents



The Massachusetts House Legislative Districts datalayer reflects the state House of Representatives district boundaries as defined by Massachusetts General Laws, Chapter 57: Section 4. These 160 districts are those used in the Fall 2012 elections and beyond, until they are redrawn based on the 2020 decennial Census.

The names of the statewide datalayers are HOUSE2012_POLY (polygons) and HOUSE2012_ARC (arcs). These replace the previous HOUSE02_ARC and HOUSE02_POLY layers.


Staff at the Massachusetts House of Representatives developed this layer with its contractor, Caliper Corp. (Newton, MA), using Maptitude for Redistricting software. MassGIS appended the 1:100,000 coastline and state outline and added the attribute fields. Election results are obtained from the Secretary of State.

In March 2018 MassGIS made minor edits to boundaries in Boston to reflect corrected data from the City of Boston. In November 2018 MassGIS made minor edits to boundaries statewide where they were offset enough from survey-based municipal lines to result in address points being assigned to the wrong district. These boundary changes have not been incorporated into U.S. Census geography that forms the basis for this layer. In January 2021, the layer was updated to reflect the results of the latest elections.


The HOUSE2012_POLY attribute table has the following fields:

DIST_CODE 10 / C District code, from Redistricting Committee
REPDISTNUM 5 / I Unique number for each district
REP_DIST 40 / C Name of the district
REP_FIRST 14 / C First name of representative
REP_LAST 25 / C Last name of representative
REP_PARTY 3 / C Political party of representative
REP 40 / C Rep.'s full name and party
URL 150 / C Rep.'s Web site address

In the HOUSE2012_ARC attribute table, the field OUTLINE is coded as follows:

  • 0 = Internal district boundaries
  • 1 = State
  • 2 = Coastline


*** These data layers have been superseded by the 2021 state House districts.

Last updated on March 10, 2022.

Also see the current state Senate and Congress data layers.

Visit the Commonwealth's Find Your Legislators page

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