Barcodes | Postal Explorer - USPS
https://pe.usps.com/BusinessMail101?ViewName=BarcodesBarcodes. A barcode is a series of long and short bars that represent ZIP Codes, ZIP+4 codes, and delivery addresses. The Postal Service uses automated equipment that reads the barcode to process and sort mail. At the Postal Service, the barcode tells us where to deliver your mail. There are different kinds of barcodes for different aspects of ...
204 Barcode Standards | Postal Explorer - USPS
https://pe.usps.com/text/dmm300/204.htmFor postal routing barcodes printed under 2.2.2, 2.2.3b, and 2.2.4b, if the postal routing barcode is printed on a separate label, the human-readable equivalent of the ZIP Code or ZIP+4 code encoded in the barcode preceded by the word “ZIP” must be printed between 1/8 inch and 1/2 inch below the barcode in 10-point or larger bold sans-serif type.