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MassGIS Data: Massachusetts House Legislative Districts (2021)

February 2024

The House Legislative Districts datalayer reflects the state representative voting district boundaries for Massachusetts that went into effect beginning with the 2022 elections. Voting resources can be found on the Secretary of the Commonwealth’s website.

Table of Contents


.zip file (4.7 MB), with ESRI Shapefiles (arc and polygon) and ArcMap layer file (.lyr)


Staff at the Massachusetts General Court Special Joint Committee on Redistricting developed this layer. Governor Baker signed the 160 districts into law on November 4, 2021, with Chapter 83 of the Acts of 2021.

The name of the statewide datalayers are HOUSE2021_POLY (polygons) and HOUSE2021_ARC (linear features).


MassGIS downloaded the data from the Joint Committee on Redistricting website and incorporated a coastline into the polygons using 2020 TIGER/Line "faces" data downloaded from the U.S. Census Bureau. MassGIS converted the polygons to linear features to produce the _ARC feature class and added attributes to both feature classes.

The data layers are based upon 2020 U.S. Census geography and therefore will not perfectly align to MassGIS's Municipalities layer (nor any others based on it).


The HOUSE2021_POLY attribute table has the following fields:

Field Name Width / Type Description
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 HOUSE2021_ARC attribute table, the field OUTLINE is coded as follows:

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


MassGIS maintains the layer and will make updates as needed.

Due to two special elections in 2023, the 9th Suffolk and 10th Suffolk attributes were updated.

Member names from the results of the November 2022 election were entered in January 2023. Coastal boundaries were updated at the same time. Polygon attributes were edited in February 2024 to reflect recent member changes.

Also see the 2021 Senate data layer.

Additional information, file formats, and PDF maps can be found on the Joint Committee on Redistricting website.

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