The first number of the five-digit code signifies the region which the address is located in, a number that grows from the east coast to the west. As of 1963, zip codes' numbers are determined by a few factors: the area, the regional postal facility and the local zone. But as the need for delivery expanded, so did the concept of the zip code. Initially, the zip code was only a two-digit number: the first denoted the city, the second denoted the state.
Because of this, they needed a simple way to help the understaffed postal service deliver mail effectively. The zip (Zoning Improvement Plan) code was created when the postal service lost a huge portion of their staff who went to fight in the war. In fact, they're only 52 years old-a concept that was introduced during World War II, and officially implemented in 1963. Zip codes are actually a much more recent phenomenon than you might believe. But besides potentially determining property taxes, what do zip codes really mean and why do we have them? Although written letters may be becoming a less popular medium of communication than email and cell phones, there will likely be a need for mail delivery for the foreseeable future-and thus, a need for zip codes.
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