Not sure how the folk in Hong Kong handle that, but as an Irishman: I always use the province (Munster) in online forms which insist on a postcode. Which works

Not sure how the folk in Hong Kong handle that, but as an Irishman: I always use the province (Munster) in online forms which insist on a postcode. Which works fine on the envelope, postman hardly notices, but leads to another one for the believing programmers: a postcode field contains a postcode