Pseudo Standard Industrial Classifications (SICs)

Pseudo SICs - To sort mail files into carrier walk sequence, DSF processing identifies the USPS-assigned sequence number for each address, and puts addresses into order by that number. The USPS number cannot be released to mailers. To identify the proper sequence for mailing, DSF processing replaces the USPS number with a pseudo-sequence number that is specific for that particular file.

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Source: Postcom, 29 March 2010 08:44:23, http://postcom.org/public/admail_image/glossary.htm