Petersburg, FL 33701-4313 33701 is the basic ZIP code, 4313 is the "+ 4"Ī ZIP + 4 code uses the basic five-digit code plus an additional four digits to identify a geographic area inside the five-digit delivery area, such as a group of apartments, or a location which gets a large amount of mail. Postal Service began using an expanded ZIP code system called "ZIP + 4", often called "plus-four codes" or "add-on codes." In 1967, these were made mandatory for many types of mail. On July 1, 1963, ZIP codes were created for the whole country but they were not mandatory. By the early 1960s a more general system was needed. What about something that actually goes in the mail? Learn about absentee vs.The postal service started the use of postal zones for large cities in 1943. The rise in post office boxes also made this greater level of precision necessary. The last two numbers, in fact, designate which segment or side of the street. This allowed senders to indicate an even more precise location, such as a particular block or apartment building. Four additional digits (preceded by a hyphen) were added to the basic code. In the 1980s a new system was introduced called ZIP+4. The last two numbers designate the specific post office within an SCF’s territory. All of the post offices that have those three digits in their ZIP code have their mail sorted and processed by the same SCF. The first three digits refer to a sectional center facility (or SCF), what is basically a network of super post offices. This is where the “improvement” part comes into play. Prior to this system, the USPS used a system of postal zones that was only applicable to large cities.
The general system of ZIP codes used today was implemented in 1963. It makes sense that the term ZIP code would be related to being zippy, which means “lively” or “peppy.” However, the USPS intentionally chose the acronym to indicate that mail travels more quickly when senders mark the postal code on their packages and envelopes. ZIP is an acronym for Zone Improvement Plan. But have you ever thought about what ZIP codes actually are? Beyond the cultural cachet of knowing (or even living in) “90210,” we don’t typically memorize them beyond our home addresses, so we tend to overlook the importance of those five digits. The 470,000 employees who work for the USPS (including the 7,000 on the Fleet of Feet delivering mail on foot) rely heavily on the five- or nine-digit ZIP codes for efficient and reliable mail delivery. But USPS workers are busy year-round: postal employees process a whopping 181.9 million of pieces of first-class mail per day! The busiest time of year for the US Postal Service coincides with the December holiday season, when we’re all busy mailing greetings and gifts alike. US ZIP codes are a type of postal code used within the United States to help the United States Postal Service (USPS) route mail more efficiently.
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