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Also called ?plus-four codes?, ?add-on codes?, or ?add-ons?, the ZIP+4 code starts with the standard five-digit ZIP Code. The four extra numbers are added after a hyphen to complete the ZIP+4. So what do the extra numbers mean? These last 4 digits represent specific delivery routes within delivery areas.

The first digit of the ZIP code is used as follows: 0 = Connecticut (CT), Massachusetts (MA), Maine (ME), New Hampshire (NH), New Jersey (NJ), Puerto Rico (PR), Rhode Island (RI), Vermont (VT), Virgin Islands (VI), APO Europe (AE), FPO Europe (AE) 1 = Delaware (DE), New York (NY), Pennsylvania (PA)

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.

Writing the wrong ZIP Code with the right address usually causes the letter to be delivered about a day later than if the ZIPCode were correct. As long as the mailing address is correct, the letter will be delivered.

A letter or parcel without a zip code is highly likely to never reach its intended destination. This is because of how the US Postal Service's automated systems process residential addresses. Here's what we mean: USPS' systems ?read? addresses from the bottom up.

If the rest of the address is correct, It will get delivered. If the 1st barcode generation does not catch it, and fix it. It will get delivered to the post office with that zipcode, A smiling Postal Worker will notice that that address does not exist in that post office, they will black out the zipcode and...

A United States postal code, for example, might be either five digits or five digits followed a hyphen (dash) and another four digits (12345-1234). If you are validating US postal codes, allow for both conditions. The following rule validates a field that can be five digits, five digits + dash + 4 digits, or blank.