ZIP Code

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ZIP Code

Zoning Improvement Plan Code. A series of five numbers identifying the area of the United States in which to deliver mail. While some ZIP codes are reserved for post office boxes and single addresses receiving large volumes of mail, most identify the general area, such as the town or neighborhood, to which correspondence is addressed. They were introduced in 1963.

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Next, the NCOA licensee will run your lists against the NCOA file, correcting addresses and adding ZIP+4 codes where they're missing.

Next, you can add in a couple days, depending on the size of the list, for running the list against CASS-certified software to add ZIP+4 codes and other incomplete address information.

Boost your mail's deliverability

Accurate and complete ZIP+4 codes are key to effective sortations.

The database connection

Other vital information on the file includes carrier routes, delivery sequence numbers, ZIP+4 codes, vacancy codes, delivery type codes and seasonal codes.

Coming clean: dirty lists equal high postage; address hygiene is the answer

For example, once your list is clean and contains ZIP+4 codes, you can spray mail with delivery point barcodes, enabling the USPS to automate the handling of your mail.