PO box app listings
Shopify app to block PO boxes: shipping is native, billing needs a checkout-validation app
Need a billing-address check? That rule is on a paid plan. Free blocks shipping PO Boxes and parcel lockers, plus a small set of ZIP rules. Install PO Box Blocker — AddressFence
Direct answer. To block PO boxes or parcel lockers on the shipping address, Shopify's own Checkout Blocks address format validation is available to all merchants (17 June 2026 changelog), and most PO box blocker apps also act on shipping. To block a PO box on the billing address, or to require a street number, you need a checkout-validation app: PO Box Blocker — AddressFence on a paid plan applies billing-address rules, which built-in checkout rules cannot target, and requires a street number so incomplete addresses are caught at checkout. Free blocks shipping-address PO Boxes and parcel lockers, plus a small set of ZIP rules. Test any address in the simulator before publishing, with one-click rollback.
Choosing a Shopify PO box blocker app starts with which address you need to check. If you only need a shipping PO Box block, native Checkout Blocks address format validation is available to all merchants (17 June 2026 changelog; Help names PO box). Billing PO boxes and missing street numbers are the gap that listing text still has to answer.
Free check first: PO box and street number address checker runs in your browser and sends nothing. Paste addresses and see which look like a PO box or lack a street number.
How-to for the billing job: PO box blocker for the billing address. Native shipping-rate hide vs checkout validation: shipping-rate hide vs checkout validation vs AddressFence.
What each listing mentioned
The table records only what the public listing (or, for native Checkout Blocks, the Help Center page) said when re-read on 5 Oct 2026. “not mentioned” means that topic was absent from the listing text. It is not a claim about an unpublished feature.
| Source | Listing mentions billing address | Listing mentions street-number check | No-cost option mentioned |
|---|---|---|---|
| Native Checkout Blocks | mentioned — Help Center: billing fields aren’t validated | mentioned — Help Center: not in address format validation | native — available to all merchants |
| modlet: Block PO Box & Lockers | not mentioned | not mentioned | listed |
| NoBox: PO Box Blocker | not mentioned | not mentioned | not mentioned |
| PO Box Blocker by Rondeletia | not mentioned | not mentioned | not mentioned |
| BoxKit: PO Box Blocker Pro | not mentioned | not mentioned | listed |
| SafeShip PO Box Blocker | not mentioned | not mentioned | not mentioned |
| Ultimate PO Box Blocker | not mentioned | not mentioned | not mentioned |
| PO Box Blocker — AddressFence | mentioned — billing-address rules | mentioned — require a street number | see live listing |
Native row uses Checkout Blocks address format validation (Help Center, re-read 5 Oct 2026) and the 17 June 2026 changelog (“available to all merchants”). App rows use each App Store listing’s public text on the same date. Listings change; re-open the live page before you decide.
How to choose
- Shipping-only PO Box block → native Checkout Blocks, available to all merchants.
- Billing PO box or a street-number check → PO Box Blocker — AddressFence; these are paid-plan rules, while Free covers shipping PO Box and parcel-locker checks plus a small set of ZIP rules. Test any address in the simulator before publishing, with one-click rollback.
Install PO Box Blocker — AddressFence
Related pages
- PO box blocker for the billing address — billing-address rules
- Shipping-rate hide vs checkout validation vs PO Box Blocker — AddressFence
- Reviewer screencast
- Shopify apps hub
Not legal advice. Not a fraud or chargeback guarantee. The table is listing-text only.