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ZIP+4 Usage Rate
Pieces Of Mail
1984 1985 1986 1987 1988
27 percent 48 66 85 90
13.8 Billion 24.5 33.7 43.4 45.9
As of late May 1984, 59 mailers had actually converted their mailing address files
to ZIP+4. Of these, 42 401 million pieces on
had qualified for an annual basis.
ZIP+4 discounts and are expected to generate Sixteen of the other 17 are expected to
collectively generate 25 million seventeenth, 200 million pieces
pieces of non-qualifying ZIP+4 first class mail, and the of third-class mail. Another 258 mailers had given USPS
definite commitments these 258 mailers are annually.
to convert to ZIP+4 by December 1984. When fully expected to generate a total of 2.1 billion pieces of first
converted, class mail
Thus, at present, the projected actual volume of ZIP+4 mail (as a 1984 year-end volume and percentage of total machinable, metered first class mail) is about 2.73 billion pieces or about 19.8 percent of the original USPS projection. It impossible, of course, that additional mailers will decide to convert before the end of 1984. It is also possible that some of these already committed to convert will not actually do so.
As shown in figure 6, the original USPS projection of 90 percent ZIP+4 usage within 5 years is considerably more optimistic than actual experience with either the U.S. 5- digit ZIP code or the Canadian 6-digit postal code. The 5-digit ZIP took 12 years to reach 90 percent usage; after 5 years, the 5-digit usage level was about 51 percent. Thus, the USPS projection shows ZIP+4 reaching 90 percent about two and one-half times
as fast (in 5 years rather than 12).