It's good to note that Google Maps has a new version since this solultion was presented.
Reference: https://developers.google.com/maps/documentation/geocoding/?csw=1#ReverseGeocoding
Here's an updated example for Google Maps v3. It makes use of the Address Components that JIssak mentions above. I should note that there is no fallback. If it fails to find a zip code, it does nothing. This may or may not be important to your script.
var latlng = new google.maps.LatLng(p.coords.latitude, p.coords.longitude);
geocoder = new google.maps.Geocoder();
geocoder.geocode({'latLng': latlng}, function(results, status) {
if (status == google.maps.GeocoderStatus.OK) {
if (results[0]) {
for (j = 0; j < results[0].address_components.length; j++) {
if (results[0].address_components[j].types[0] == 'postal_code')
alert("Zip Code: " + results[0].address_components[j].short_name);
}
}
} else {
alert("Geocoder failed due to: " + status);
}
});
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