233.2 Single Directionals
233.21 Predirectional Field
When parsing the address from right to left, if a directional word is found as the first word in the street name and there is no other directional to the left of it, abbreviate it and locate it in the predirectional field of the ZIP+4 file for standardization purposes.
233.22 Postdirectional Field
233.23 Two Directionals
When two directional words appear consecutively as one or two words, before the street name or following the street name or suffix, then the two words become either the pre– or the postdirectionals. Exceptions are any combinations of NORTH-SOUTH or EAST–WEST as consecutive words. In these cases the second directional becomes part of the primary name and is spelled out completely in the primary name field.
When parsing from right to left, if the directional word appears between the street name and the suffix, then it appears as part of the primary name spelled out in the ZIP+4 file and is spelled out on the mailpiece.