I'm creating a form and want to require / hide the state/province field based on the selected country. What countries require a state in the mailing address? For example, the United States does.
Not a complete list:
- China (PRC)
- Italy (strictly speaking; we don't collect Italian provinces and I don't think we've ever had a problem with sending mail there)
To the best of my knowledge no other European country requires states/provinces in addresses.
Also see http://www.bitboost.com/ref/international-address-formats.html for more info.