https://wikipedia.org, in 2015 there were a
little over 42,000 ZIP® Codes in the United States.
ZIP® Codes are determined by the
United States Post Office (USPS) and are constantly
updated and maintained by them. We update our ZIP®
Codes from the USPS, once a year.
According to the USPS, annual ZIP® Code updates amount
to less than 0.0025% of the total number of ZIP® Codes.
That's about 2 ZIP Codes per state. These days, very few ZIP codes are deleted
or added each year.
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 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 is an excellent
marketing tool, at a