map does not find all zip codes even if they exist

What is your url?

may I pass you the url somehow private? or only public possible?

You can mail the url to info at tijmensmit.com.

ok thank you, done

Many thanks for your answer.

Do post your good answer if someone does have the same prob:

The Google Maps API doesn’t know the 4000 zipcode in Switzerland.
https://maps.googleapis.com/maps/api/geocode/json?address=4000

If you search for it through the store locator it returns coordinates in
Bulgaria
https://maps.googleapis.com/maps/api/geocode/json?latlng=42.1450502,24.755847500000073&sensor=true

Not much I can do about it. But it’s generally better to just search for
a city I think to guarantee it always working.