In your Shopify admin, go to Apps and open Address Ninja. Click ZIP / Postal Code Block. Search and add the countries where you want to block specific ZIP / postal codes. Enter the codes you want to block in the text field for each country - you can use exact codes like "12345", wildcards like "900*" to block all codes starting with 900, or multiple patterns separated by commas. Click Activate. You can customize the error message that customers see when they enter a blocked ZIP / postal code.*
Use cases: Block high-risk fraud zones, restrict delivery to certain areas, manage temporary service disruptions, or ensure compliance with regional regulations.
Originally from our Help Center