https://github.com/mbostock/d3
Raw File
Tip revision: 067959832875993b721a27a322c8944bf5dcd1a3 authored by Mike Bostock on 28 April 2011, 18:43:26 UTC
Better jittering for coincident nodes.
Tip revision: 0679598
README
These are derived from the cartographic boundary files from the 2000 U.S. Census:

http://www.census.gov/geo/www/cob/bdy_files.html

Then, MapShaper was used to simplify the geometry, and ogr2ogr to convert the shapefiles to GeoJSON. Some additional work was done to preserve the FIPS codes, which are dropped from the shapefiles by MapShaper.
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