March 1991

Download these layers
(ESRI Shapefiles with ArcGIS .lyr and ArcView 3x .avl)

Overview

MassGIS derived the boundaries of the 14 counties in Massachusetts from the community boundaries datalayers. Three statewide layers are available:
  • COUNTIES_POLY - contains the 1:100,000 coastline (from the TOWNS coverage); single-part polygons, with each county comprising one or more features.
  • COUNTIES_POLYM - contains the 1:100,000 coastline (from the TOWNS coverage); multi-part polygons, with one feature per county.
  • COUNTYNC_POLY - contains the full municipal boundaries extending offshore (from the BOUNDARIES coverage)
For locations of the counties please see the Counties Index Map pdf format of    Mass. Counties Index Map  file size 2MB .

Production

Using ARC/INFO, the TOWNS and BOUNDARIES layers were dissolved based on the FIPS_STCO field for the COUNTIES_POLY and COUNTIESNC_POLY layers, respectively.

The COUNTIES_POLYM layer was produced in August, 2007, using ArcGIS 9.2 by dissolving the COUNTIES_POLY layer on unique FIPS_ID/COUNTY combinations, with summary statistics for AREA_ACRES.

Attributes

COUNTIES_POLY and COUNTIES_POLYM contain these items:
FIPS_ID Federal Information Processing Standard state/county code
COUNTY County name
AREA_ACRES County area in acres
COUNTYNC_POLY contains these items:
FIPS_COUNTY the unique identifier for each quad corner
FIPS_ID Federal Information Processing Standard state/county code
COUNTY County name
The FIPS_ID - County pairs are as follows:
FIPS_ID COUNTY
25001 BARNSTABLE
25003 BERKSHIRE
25005 BRISTOL
25007 DUKES
25009 ESSEX
25011 FRANKLIN
25013 HAMPDEN
25015 HAMPSHIRE
25017 MIDDLESEX
25019 NANTUCKET
25021 NORFOLK
25023 PLYMOUTH
25025 SUFFOLK
25027 WORCESTER

Maintenance

MassGIS is maintaining these layers.

Last Updated 5/30/2007