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The RENFE site is poorly programmed for foreign purchases. It makes fields that are Spanish-centric (eg Province & Postal Code) mandatory. You are not going to be able to purchase a ticket with an address in North America.
I recently tried purchasing a ticket from North America with no success...
This site is run by Ivar at in Santiago de Compostela.
This site participates in the Amazon Affiliate program, designed to provide a means for Ivar to earn fees by linking to Amazon