As pointed out by mbesto, the UK system is pretty slick, and could be refined down to just two fields, however it would require breaking the standard flow of ad

As pointed out by mbesto, the UK system is pretty slick, and could be refined down to just two fields, however it would require breaking the standard flow of address input forms. With a street number, and a zip/postal code, you can get Street Name, City, and State in one fell swoop.