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Hi there. As far as I understand, province is equivalent of state. Since most countries don't have states, but their local state "substitutions", this is where you'd put it in. I'm not sure how you guys have it in Britain, but here is example of russian address - 123 Blabla st, City, Udmurt Republic (this one would be province), Russia. Hope this helps. P.S. If you don't have specific province to put in, I'd leave it blank.