Help · Validation rules
Blocked ZIP / postal codes
List exact ZIP or postal codes you can't serve, and checkout blocks them on the spot. Useful for areas your carrier won't touch or surcharges heavily.
What this rule does
Carriers publish lists of ZIP codes they don't serve or hit with remote-area surcharges that eat your margin. If a code is on your no-go list, the order stops at checkout instead of becoming a refund and an awkward email.
When to use it
- List 99950 to stop shipping to Ketchikan, Alaska (no road access, surcharge territory)
- Remote-area codes your carrier contract excludes
Codes match exactly as entered. A listed code always hard-blocks; there is no warn level for lists.
What your buyer sees
Blocklists always act at checkout. Your buyer sees the message right at the address field, before payment, and checkout continues only with an address you can serve. Our default message:
You can replace it with your own wording in the rule's settings.
If a check can't run for any reason, the order goes through untouched. We never hold up a sale on our own uptime.
Set it up
Open Address Verifier in your Shopify admin, go to Settings, and pick Blocked ZIP / postal codes. Add your entries (one per line), write your own checkout message if you want one, and save. Changes are live on your next checkout. No deploy, no theme edit.
New installs start with an empty list. Add an entry and it blocks on your next checkout.
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