When making online purchases with a Visa gift card, you will be asked to provide a billing address, including a zip code. However, the zip code to use for a Visa gift card is typically associated with the billing address provided by the person who purchased or activated the card. Therefore, you should use the zip code associated with the billing address you provided when you purchased or activated the gift card. If you are unsure which zip code to use, you can check the instructions that came with the gift card or contact the issuers customer service for assistance.