Catalog of Holdings

Study Report

Study Number: AD-003-001-1-1-United States-UCLA-1789

Subject Area: Legislative District

Bibliographic Citation: Digital boundary definitions of United States Congressional Districts, 1789-2012.  [machine-readable data file] / Lewis, Jeffrey B.  [principal investigator(s)] / Los Angeles, CA: University of California. Department of Political Science  [distributor].

Originating Archive Number: cdmaps

Date Accessioned: 2/26/2014

Number of Files Received: 0

Comments: Data files are in ERSI's shapefile format and organized by Congress and can be downloaded at They were first released on February 15, 2014.

Access Status: Unrestricted access

Documentation: Document files are available at

Abstract: This collection of digital boundary definitions for every U.S. Congressional District between 1789 and 2012 were produced as part of NSF grant SBE-SES-0241647 between 2009 and 2013. These shapefiles were considered as an initial-release version by the principal investigators. Many districts in this series were formed by aggregating complete county shapes obtained from the National Historical Geographic Information System (NHGIS) project and the Newberry Library's Atlas of Historical County Boundaries.

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