The next was 01001, given to Agawam in Massachusetts. It was the first zone established by the Zone Improvement Plan.
#Brikksen phoenix zip code code#
The first ZIP code ever given out was 00601, given to Adjuntas, Puerto Rico. Large population centers like New York and San Francisco began with larger double-digit numbers while smaller population centers in the mid-West had only 5 digits. The first 2-3 numbers informed mail carriers which states the mail was traveling to. These 5-digit regional codes were the first modern ZIP codes. This plan sectioned the entire United States into separate delivery regions, each with its own number. Therefore, the internal advisors to the post office suggested the creation of the Zone Improvement Plan (ZIP). had nearly doubled, which made any flaws in the post office’s sorting and distribution system incredibly apparent. creates the first standardized ZIP codeīy 1963, the “baby boom,” or post-war population boom, had caused urban growth in the United States to reach a point that the post office needed major reform to keep up. Since there is no rule for ZIP+4 codes, each has to be looked up separately, for instance, using the ZIP Code Lookup on the United States Postal Service’s website.Įvent: The U.S.
#Brikksen phoenix zip code plus#
They can be the last four digits of the box number, a zero plus the last three digits, or a smaller box number with enough zeroes before it to make four numbers total. The add-on or +4 digits can take multiple forms. However, every PO box still technically has one and businesses often use them, especially in rented office buildings, to ensure that their deliveries make it on time. In any case, the +4 code is not a required part of listing a delivery address the post office decided that it could not be reinforced. However, people resisted the standardization of the +4 system on their own deliveries and generally don’t list it. It sorts the mail accordingly based on the 11 digits in total that a ZIP code now has – five for the ZIP, plus four, and two more to differentiate the delivery point.Įvery PO box has a +4 ZIP code to make it easier on mail carriers. This add-on gives the character readers at the post office the ability to scan an address and automatically know the +4 code. This adds four digits to the code to make mail sorting and delivery more efficient. This is why ZIP+4 was put into effect.įor example, people living in dense groups of apartments, with specific PO boxes, or on especially crowded city blocks, could be further differentiated by a ZIP code using the +4 system. However, more specific addresses still slowed down mail delivery times due to the imprecise nature of the five-digit system. This worked perfectly well for houses on city streets or buildings. ZIP codes between 19 were only five digits long. Event: ZIP codes get 4 extra digits to add clarity
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