The Massachusetts House Legislative Districts (2012) datalayer reflects the state House of Representatives district boundaries as defined by Massachusetts General Laws, Chapter 57: Section 4. These 160 districts were those used in the elections from 2012 and prior to 2022, when they were superseded by the 2021 House Districts.Staff at the Massachusetts House of Representatives developed this layer with its contractor, Caliper Corp.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.

This shapefile delineates the Legislative District boundaries for New Jersey, 2011 - 2020. It is the original version created by the 2011 redistricting round of the NJ Apportionment Commission, based on geographic and demographic data from the US Census Bureau, 2010 census. It was created using Maptitude. An unofficial version also is available, which is based on the best available municipal boundary GIS data for NJ.The downloadable zip file contains the official release, and source files for Newark and Jersey City (split districts).