# How to Block PO Box Addresses at Shopify Checkout

URL: https://geofraudshield.com/blog/block-po-box-addresses-shopify-checkout
Published: 2026-10-07
Reading time: 7 min read
Category: Tutorial
Author: Robert John, Founder & CEO at Blockly (https://geofraudshield.com/about#robert-john)
Publisher: Blockly (https://geofraudshield.com)

## TL;DR

Some carriers can't deliver to PO boxes, and some products shouldn't ship there. Here's how to block PO box addresses at Shopify checkout reliably, with clear messages and fewer edge-case failures.

## Key points

- You ship with a courier that only delivers to physical street addresses
- You sell large, heavy, or oversized items that won't fit in a box
- Your products require a signature or age verification on delivery
- You ship hazardous or restricted goods with carrier restrictions
- You offer same-day or local delivery by your own drivers
- Block them along with PO boxes if your carrier truly can't deliver

## Questions this answers

- How does shopify work on Shopify?
- How does checkout customization work on Shopify?
- How does po box work on Shopify?
- How does address validation work on Shopify?
- How does shopify functions work on Shopify?

## Primary sources referenced

- Shopify Functions (Shopify developer docs): https://shopify.dev/docs/apps/build/functions

## Citation format

Blockly (2026). How to Block PO Box Addresses at Shopify Checkout. https://geofraudshield.com/blog/block-po-box-addresses-shopify-checkout