May 2014

Download this layer (.zip file, 1 MB):
 - ESRI Shapefiles (arc and polygon)
 - ArcMap layer files (.lyr) (for ArcMap 10 and 9.0*)
* The data sources in the LYR for Arc 9 will need to be reset)


The U.S. Congressional Districts datalayer reflects the U.S. House of Representatives voting district boundaries as established for the 113th Congress. These boundaries took effect in January 2012. The name of the statewide datalayers are CONGRESS113_POLY and CONGRESS113_ARC. These layers replace the old layers (CONGRESS108_ARC and CONGRESS108_POLY), which represented boundaries established for the 108th Congress.


Staff at the Massachusetts General Court Special Joint Committee on Redistricting 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 Representatives' name and party attributes.


The CONGRESS2012_POLY attribute table has the following fields:
CD113 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 (D = Democrat)
REP 25 / C Rep.'s full name and party
URL 50 / C World Wide Web address for Representative

In the CONGRESS113_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. In January 2013 and May 2014 the polygon attributes were updated with the information for members of the 113th Congress. Also see the state House and Senate data layers.

Last Updated 5/15/2014