OpenEuphoria

Re: ZIP

• Posted by Jeff Zeitlin <jzeitlin at CYBURBAN.COM> Jul 17, 2000
• 422 views

On Mon, 17 Jul 2000 00:00:56 -0400, Kat <gertie at PELL.NET> wrote:

>In some of the usa, the 5 digits can have many more after them, typical is=
> another 4
>digits, such as:
>20500-3456
>where the 3456 designates the route in the area.
>

There are three allowable (and standardized) formats for ZIP
codes in the United States.  All three formats are usable
anywhere in the country; there is no regional usage of ZIP codes.

Format 1: Area only - this is the "traditional" five-digit ZIP
code that represent the original implementation of the Plan.
Note that it is always exactly five digits; leading 0 is not
dropped.

Format 2: Carrier Routing - this is the so-called "ZIP+4" code -
the Area-only code is followed by a hyphen and four digits
indicating which carrier route the address is on.  This is
supposed to speed sorting.  Carrier Routing with leading zeroes
generally indicates box numbers at the Post Office indicated by
the five-digit code (e.g., 10001-0001 indicates PO Box 1, New
York, NY 10001).

Format 3: Address Routing - This adds an additional three digits
to the Carrier Routing ZIP+4 code.  The first two digits of the
three are the last two digits of the house number; the third
digit is the "residue-ten" of the other eleven digits.  This is
rarely used; the only usage I have seen to date was Census forms
and IRS forms mailings.  To compute the "residue-ten", add up all
of the digits, take the last digit of the result, and subtract it
from ten.  Example: Assume that the carrier route for 1600
Pennsylvania Ave, Wash. DC is 1015.  This makes the ZIP+4 code
20500-1015.  To this, we add the last two digits of the address
number: 20500-101500.  To compute the "residue-ten", we compute
2+0+5+0+0+1+0+1+5+0+0, which is 14.  The last digit of 14 is 4;
we subtract 4 from 10 and get 6, so the last digit is 6:
20500-1015006.

--
Jeff Zeitlin
jzeitlin at cyburban.com