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So what do the extra numbers mean? These last 4 digits represent specific delivery routes within delivery areas. This extra detail means an even more precise matching to a more granular level. It could represent a handful of houses on one side of a street, or even a single building that receives a high volume of mail.

Click the ?ZIP Code Tabulation Area? box using the geography filters on data.census.gov. This provides data through Summary Level 860 from the decennial census and American Community Survey.

If the mailpiece is addressed incorrectly and has no return address, the mailpiece will either be handled by the local Post Office? or sent to the Mail Recovery Center.

ZIP Codes? are an integral part of making sure your mailpiece is processed quickly and efficiently. Not having a ZIP Code? on your mail causes unnecessary delay because it will require manual look-up.

Automated mail processing machines read addresses on mailpieces from the bottom up and will first look for a city, state, and ZIP Code. Then the machines look for a delivery address. If the machines can't find either line, then your mailpiece could be delayed or misrouted.

It'll be delayed but eventually delivered. Unless it goes to the wrong address in which case you're at the mercy of the recipient and whether or not they give it back to the mail carrier.

Large user organisations have a postcodes entirely to themselves, however it's unlikely your letter will reach the intended recipient when it arrives at the destination. Including the postcode in a letter is essential to ensure it is delivered to the correct address.