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PostBar, also known as CPC 4-State, is the black-ink barcode system used by Canada Post in its automated mail

sorting and delivery operations. It is similar to other 4 State barcode systems used by Australia Post and the United Kingdom's Royal Mail (from which it derives), but uses an obscured structure and encoding system unique to Canada Post. This particular bar code system is used on "flats" (which are larger-than-letter-size pieces of mail, such as magazines) and parcels.

The 4-State(PostBar)  barcode is a barcode used by postal services that consists of four barcodes of different heights that can represent numbers and letters.

The 4-State barcode is a variant developed on the basis of the circular barcode.

4-State barcodes are mainly used in postal services and can indicate the starting and ending location, category, date and other information of the mail.

Postal services in different countries and regions use different barcodes, such as the Intelligent Mail barcode in the United States, the Royal Mail 4-State barcode in the United Kingdom, the Japan Post barcode in Japan, etc.

Its historical origins date back to 1949, when Norm Woodland and Bernard Silver invented the omnidirectional barcode symbology. Later, they improved this symbol into a circular barcode, which was patented in 1952.


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