What is included in the bar code information?
A delivery point barcode contains 62 vertical lines. The first and last bars must be tall and are synchronizing bars. In groups of 5 bars the remaining 60 bars form 12 groups. From left to right the bars stand for the following: The five digit zip code, the plus four, the delivery point (2 groups usually the last 2 digits of the house number) and check digit. This is why you sometimes hear of a zip+4+2+1.
