You can grab JSON data of all ISO recognized countries and their address formats on GitHub (apologies, I forget the repo name. IIRC there is more than one).
I don't know if it's 100% accurate, but it's not very hard to implement it as part of an address entry form. I think the main issue is that most developers don't know it exists,
I don't know if it's 100% accurate, but it's not very hard to implement it as part of an address entry form. I think the main issue is that most developers don't know it exists,