ZIP® Codes are generated by the
United States Post Office (USPS) and are constantly
updated and maintained. We update our ZIP®
Code list once a year based on the USPS database.
According to the USPS, ZIP® Code updates amount
to less than 0.1% of the total number of ZIP® Codes,
https://wikipedia.org, in 2015 there were a
little over 42,000 ZIP® Codes in the United States.
ZIP® Codes are used for tracking U.S. mail and gathering
geographical statistics in the United States. Because
ZIP® Codes are the cornerstone of the U.S. Postal
Service (USPS) mail distribution system, USPS has
long resisted changing them for any reason other
than to improve the efficiency of mail delivery.
For the purposes of marketing to specific media
markets, our ZIP® Code database serves our customers
well at a