City / Zipcode / County Lookup instructions:

http://www.nerdgeekhero.com/zipcodes/

Use this service to perform a lookup on a city or zipcode to complete the information.

This service returns JSON data.

FIELDNAME	DATA TYPE	ACCEPTED VALUES	REQUIRED
city	text	Any	NO
zipcode	numeric	Any	NO
At least one field must be supplied to return data

EXAMPLES
http://nerdgeekhero.com/zipcodes/?zipcode=99999 {"result":{"error":"No zipcodes found matching 99999"}}
http://nerdgeekhero.com/zipcodes/?zipcode=94107 {"result":[{"city":"San Francisco","state":"CA","zipcode":"94107","county":"San Francisco"}]}
http://nerdgeekhero.com/zipcodes/?city=Gilroy {"result":[{"city":"Gilroy","state":"CA","zipcode":"95019","county":"Santa Cruz"},{"city":"Gilroy","state":"CA","zipcode":"95020","county":"Santa Clara"}]}