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ZCTAs are generalized area representations of the United States Postal Service (USPS) ZIP code service areas, but are not the same as ZIP codes. Individual USPS ZIP codes can cross state , place, county , census tract , census block group and census block boundaries, so the Census Bureau asserts that "there is no correlation between ZIP codes ...
There are generally two widely accepted versions of a postal code: a ZIP code and a ZIP + 4 code. Established in 1963, ZIP codes are the most common and recognizable postal code used by the USPS.
U.S. ZIP codes. ZIP codes 006XX for NW PR, 007XX for SE PR, in which XX designates the town or post office and 009XX for the San Juan Metropolitan Area, in which XX designates the area or borough of San Juan. The last four digits identify an area within the post office.
ZCTAs or ZIP Code Tabulation Areas are the census equivalent of ZIP codes used for statistical purposes. The reason why regular ZIP codes are not used is because they are defined by routes rather than geographic boundaries. Thus, they have the tendency to overlap and otherwise create difficulties.
A 1974 postage stamp encouraging people to use the ZIP Code on letters and parcels. A ZIP Code (an acronym for Zone Improvement Plan [1]) is a system of postal codes used by the United States Postal Service (USPS).
The U.S. Postal Service had been providing a premium level "air mail" service since the introduction of regular air transportation. As air transportation reliability improved and cost per ounce of mail decreased, it began to make financial sense to transport larger quantities of mail via intercontinental airlines rather than ship, and interstate via the old airmail routes rather than via train.
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