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- ESRI Shapefiles (arc and polygon)
- ArcMap layer files (.lyr) (for ArcMap 10 and 9.0*)
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The Massachusetts Senate Legislative Districts (2012) datalayer reflects the state Senate district boundaries as defined by Massachusetts General Laws, Chapter 57: Section 3. These 40 districts are those used in the Fall 2012 elections and beyond, until they are redrawn. The names of the statewide datalayers are SENATE2012_POLY (polygons) and SENATE2012_ARC (arcs). These replace the older SENATE02_ARC and SENATE02_POLY layers.
View and query these data in the Legislative District Viewer. Users may search for their district based on municipality, legislator, or district name. When identifying the districts, the results contain links to their senator's Web pages.
Staff at the Massachusetts Senate 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 senators' name and party attributes. Final election results were obtained from a "Return of Votes" report (in PDF format) from the Secretary of State.
The SENATE2012_POLY attribute table has the following fields:
FIELD NAME WDTH / TYPE DESCRIPTION SENDISTNUM 5 / I Senate District number SEN_DIST 43 / C Name of Senate District SEN_FIRST 13 / C First name of Senator SEN_LAST 15 / C Last name of Senator SEN_PARTY 3 / C Senator's political party SENATOR 40 / C Senator's full name and party URL 150 / C Senator's Web site address
In the SENATE2012_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 the polygon attributes were updated with the information for members of the 188th General Court. Polygon attribute updates reflecting special elections were published on May 29, 2013. Additional polygon updates were published on May 15, 2014. Also see the state House and Congress data layers.
Last Updated 5/14/2014