USPS tray label is one of the most widely used linear barcode symbology that is used in United States Postal Services (USPS) for labeling of postal trays, automation rate mailings, periodicals /standard mail (letter size and flat size pieces) etc.
USPS tray labels consists “zip code” of the receiver and a content identifier number
USPS tray label barcode has the following structure:
USPS Tray Label barcode symbology is in fact Interleaved 2 of 5 symbology which encoded exactly 10 digits. USPS tray label barcode encodes five digits Zip Code (the tray destination), three digits content identifier number (CIN) and two digit USPS processing code
Barcode tray labels and sack labels must not be interchanged. Tray label is used for trays and sack labels is used for sacks. In barcoded tray labels the destination line must be completely visible when placed in the label holder. This visibility is ensured if the destination line is no less than 1/8 (0.125) inch below the top of the label when the label is cut and prepared.
The destination line contains only the information required by the applicable standards for the class, processing category, sortation level of the tray or sack labels and the rates claimed. This information contains in module labeling lists for all sortation and rate levels except trays and sacks to carrier route, 5-digit carrier routes, merged 5-digit, and 5-digit destinations, and except for automation letter trays to 5-digit scheme destinations.