Dating web sites by zipcodes
(Thus, the check digit for 10001-0001 00 would be 7, since 1 1 1=3, 3≡3(mod 10) and 10–3=7.) ZIP Codes designate delivery points within the United States (including territories), and overseas stations of its armed forces. C.; 81009 for the Federal Citizen Information Center of the U. General Services Administration (GSA) in Pueblo, Colorado.
There are also ZIP Codes for independent countries of the Federated States of Micronesia, the Republic of the Marshall Islands, and the Republic of Palau, each of which is integrated into the U. Examples of private address unique ZIP Codes include the headquarters of Wal-Mart (72716).
However, there is no uniform rule, so the ZIP 4 Code must be looked up individually for each box.
The ZIP Code is often translated into an Intelligent Mail barcode that is printed on the mailpiece to make it easier for automated machines to sort.
These steps are usually done with PAVE-certified software that also prints the barcoded address labels and the barcoded sack or tray tags.
This means that every single mailable point in the country has its own 12-digit number (at least in theory).
Sectional centers do not deliver mail and are not open to the public (though the building may include a post office open to the public), and most of their employees work night shift.
Mail picked up at post offices is sent to their own SCF in the afternoon, where the mail is sorted overnight.
The United States Post Office used a cartoon character which it called Mr. He was often depicted with a legend such as "USE ZIP CODE" in the selvage of panes of postage stamps or on the covers of booklet panes of stamps. Postal Service introduced an expanded ZIP Code system that it called ZIP 4, often called "plus-four codes", "add-on codes", or "add-ons".
The abbreviations have remained unchanged, with the exception of Nebraska, which was changed from NB to NE in 1969 at the request of the Canadian postal administration, to avoid confusion with the Canadian province of New Brunswick.
The post office only credits Moon with the first three digits of the ZIP Code, which describe the sectional center facility (SCF) or "sec center." An SCF is a central mail processing facility with those three digits.
The SCF sorts mail to all post offices with those first three digits in their ZIP Codes.
The mail is sorted according to the final two digits of the ZIP Code and sent to the corresponding post offices in the early morning.