Postal code guides
Every guide we have published, from every country we cover. How the codes are structured, what the parts mean, and where address forms go wrong. Or skip the reading and detect your postal code now.
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formsCanadaValidating and Storing Canadian Postal CodesCanadian postal codes are easier to validate than most and still get corrupted constantly. The rules worth enforcing, the ones that reject real addresses, and what to do about the ZIP code field.Read more
formatCanadaThe Six Letters a Canadian Postal Code Never UsesD, F, I, O, Q and U never appear in a Canadian postal code, and the first letter is a province shorthand that quietly fails at the edges. Both facts are useful and both are commonly misused.Read more
formatCanadaFSA vs LDU: The Two Halves of a Canadian Postal CodeThe first three characters of a Canadian postal code describe a place. The last three describe a delivery round. Nearly everything confusing about the system follows from that split.Read more