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USPS has an API: http://www.usps.com/webtools/address.htm http://www.usps.com/webtools/address.htm Census.gov has downloadable data: http://www.census.gov/geo/w
by byoung2 16y ago
USPS has an API: http://www.usps.com/webtools/address.htm http://www.usps.com/webtools/address.htm
Census.gov has downloadable data: http://www.census.gov/geo/www/tiger/tigermap.html#ZIP http://www.census.gov/geo/www/tiger/tigermap.html#ZIP