Retrieving the US Postal Zip code for a street address using Python

May be a start: The Zip Code Database Project

googlemaps – Google Maps and Local Search APIs in Python

GoogleMaps.geocode(query, sensor='false', oe='utf8', ll='', spn='', gl='')

Given a string address query, return a dictionary of information about that location, including its latitude and longitude. Interesting bits:

>>> gmaps = GoogleMaps(api_key)
>>> address = '350 Fifth Avenue New York, NY'
>>> result = gmaps.geocode(address)
>>> placemark = result['Placemark'][0]
>>> lng, lat = placemark['Point']['coordinates'][0:2]
# Note these are backwards from usual
>>> print lat, lng
40.6721118 -73.9838823
>>> details = placemark['AddressDetails']['Country']['AdministrativeArea']
>>> street = details['Locality']['Thoroughfare']['ThoroughfareName']
>>> city = details['Locality']['LocalityName']
>>> state = details['AdministrativeAreaName']
>>> zipcode = details['Locality']['PostalCode']['PostalCodeNumber']
>>> print ', '.join((street, city, state, zipcode))
350 5th Ave, Brooklyn, NY, 11215