By including delivery point information, it enables the Postal Service to sort mail into delivery point (address) sequence. This is usually referred to as the DPBC, or Delivery Point Bar Code. The 9-digit barcode enabled the sorting of mail to the individual delivery carrier, and in some cases into a semblance of delivery sequence.Īn 11 digit (plus check digit) barcode, containing the ZIP Code, ZIP+4 Code, and the delivery point code. Now obsolete.Ī 9 digit (plus check digit) barcode, containing the ZIP Code and ZIP+4 Code, referred to as the "C" code. This barcode was only found on mail that received a 5-digit barcode on the initial coding by an OCR. In the early stages of Postal automated mail processing the B code was used to "upgrade" mail that had been coded only with a 5-digit "A" code. 32 bars total.Ī 6 digit (plus check digit) barcode, containing the last 2 digits of the ZIP Code and the 4 digits of the ZIP+4 Code, referred to as a "B" code. There have been four formats of Postnet barcodes used by the Postal Service:Ī 5 digit (plus check digit) barcode, containing the basic ZIP Code only, referred to as the "A" code. Together with the initials and terminal frame bars, this would be represented as: The ZIP+4 of 55555-1237 yields a check digit of 2 for encoded data of 5555512372 The following table shows the encoding for decimal digits: (Though in this scheme, zero is encoded as 11 in decimal, or in POSTNET "binary" as 11000.)Įncoding San Bernardino USPS Processing and Distribution Center with valid and correct barcode on building The full bars represent "on" bits in a pseudo- binary code in which the places represent, from left to right: 7, 4, 2, 1, and 0. The encoding table is shown on the right.Įach individual digit is represented by a set of five bars, two of which are full bars (i.e. The barcode starts and ends with a full bar (often called a guard rail or frame bar and represented as the letter "S" in one version of the USPS TrueType Font) and has a check digit after the ZIP, ZIP+4, or delivery point. Most often, the delivery point is added, usually being the last two digits of the address or PO box number. The ZIP Code or ZIP+4 code is encoded in half- and full-height bars. POSTNET ( Postal Numeric Encoding Technique) is a barcode symbology used by the United States Postal Service to assist in directing mail. For the shipping and printing company, see PostNet (company). This article is about the United States Postal Service Barcode.
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