[jon_richards]

And yet we still enter zip code after the rest of the address.

[pjc50]

Huh. In the UK we usually enter postcode plus house number and have the computer look up the rest of the address (even though that's a paid API).

[dambi0]

A UK post code is much more specific than a five digit zip code which might be one reason why.

[graemep]

Good point, but because the postcode database was privatised it will always have to be a paid service which is why not everyone uses it.

[wat10000]

A lot of sites these days have some sort of live search functionality that apparently knows about all addresses. There, I can type in my house number and maybe the first three letters of my street name and it somehow manages to find me.