The Coding Accuracy Support System (CASS) improves the accuracy
of carrier route, five-digit ZIP, ZIP+4, and delivery point
codes that appear on mail pieces. The encoding process performs
the following procedures:
Edit and parse the address file to be matched. Parsing
requires that the individual elements that make up an
address are isolated, edited, and standardized. Parsing
separating the individual words of the address (ZIP
Code, street name, suffix, directionals, etc.) based
on spaces, commas, periods, colons, other delimiters,
or field position
distinguishing elements such as apartment, suite,
room, etc. and placing them in a secondary address
field placing company names, building names, or other
secondary information in a secondary name field
standardizing the state field as shown in the Postal
Addressing Standard, Publication 28 or the AIS Product
Convert numeric street primary names from alphabetic
spelling to numeric equivalent.
Standardize the street suffix field to conform to USPS
Standardize directionals to conform to USPS directionals.
Correct spelling of city names.