alt Hacker NewsZIP Code (tm) is claimed as a trademark by the US Postal Service. If you don’t have a ZIP Code, why would you put something in the ZIP Code field?
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pstuart • today at 12:16 AM
Put a postal code first.
Include a field for the country that is autofilled via Geolocation API or geoip if that's unavailable.
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Because most websites won't have two separate fields for "ZIP code" and "postal code". Even if they knew that ZIP Code is a trademark (I didn't until you mentioned it), they would (wisely) know that putting in two fields would just confuse most people. So they put in one field. Many sites label it as "ZIP code / postal code", but some just label it as "ZIP code". But the intent is clear: put in the multi-digit string that identifies your address, whether your country calls it a ZIP code or a postal code.