On Aug 21, 8:04 pm, Rick <[email protected]> wrote:
> If you are looking for US data, you can download them from US Census
> in ESRI shape format. Then you need to extract the coordinates from
> it, construct the Polygon and overlay it on Google map.

The same public domain information is available for free from the U.S.
Census Department

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

    http://www2.census.gov/cgi-bin/shapefiles/national-files

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