How can I change my postcode? March 24, 2023 06:21 Updated Changing your postcode Underneath the blue navigation bar at the top of the site, you will see a grey bar with "Delivery postal code" next to your current postcode. To update this, click "Change", enter the correct postcode, then click "Set delivery postal code". https://www.costco.com.au/business-delivery/can-i-change-my-postcode Related articles I received the error message “There is no warehouse serving postcode (your postcode)” How do I renew my membership? Executive Membership After changing my postcode, I noticed that a product I’m after is out of stock Can I organise Business Delivery returns or refunds online?