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MassGIS Data: U.S. Congressional Districts (118th)

January 2023

The 118th U.S. Congressional Districts datalayer reflects the U.S. House of Representatives 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 (2.8 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 new districts into law on November 22, 2021, with Chapter 93 of the Acts of 2021.

The name of the statewide datalayers are CONGRESSMA118_POLY (polygons) and CONGRESSMA118_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 CONGRESSMA118_POLY attribute table has the following fields:

Field Name Width / Type Description
DIST_NUM 2 / I Unique number for each district
DISTRICT 50 / C District name
REP_FIRST 16 / C First name of representative
REP_LAST 16 / C Last name of representative
REP_PARTY 1 / C Political party of representative
REP 25 / C Rep.'s full name and party
URL 50 / C Web address for Representative
DISTRICT 3 / I Meeting number of the current Congress (116)


In the CONGRESSMA118_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.

Member names from the results of the November 2022 election were entered in January 2023. Coastal boundaries were updated at the same time.

Also see the state House and Senate data layers.

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

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