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I live in one of those countries and I think people are over-analysing the problem. I think you're perfectly safe with:

Addr 1 (req) Addr 2 (optional) State (req but including "Outside US") Country (req) Post/Zip Code (optional outside US)

When I order stuff from the US I just put my city and state in the Addr 2 line.

In the end this is a classic example of the "perfect being the enemy of the good". Look at where your sales are going and allocate validation efforts accordingly. A lot of sites include Canadian provinces in the "state" field for example.

This piece of advice is so obvious that it makes me wonder why we need to have this discussion in the first place.

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