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In essence, both postal codes and zip codes serve a very similar purpose—which is appending additional information to an address to ensure fast and accurate mail delivery for users. Zip code refers to a type of postal code and is used primarily in the United States and the Philippines.

A research technique in which the market is segmented by the socio-demographic information obtained in a zip code area. It has the assumption that a zip code neighbourhood has common patterns of purchasing. See also postcode analysis.

The Zip Code Analysis Project The project isolates risk communities with high incidence and/or prevalence of chronic diseases, evaluates the impact of specific interventions, and monitors changes in health service and status.

ZIP codes themselves do not actually represent an area, rather a collection of routes: Despite the geographic derivation of most ZIP Codes, the codes themselves do not represent geographic regions; in general, they correspond to address groups or delivery routes.

The first number in the code represents a general geographic area of the nation, “0” in the East, moving to “9” in the West. The next two numbers represent regional areas, and the final two identify specific Post Offices.

The code became a tool for organizing and displaying demographic information while also allowing for the efficient sorting and dispatching of mail. Over the span of 50 years, the ZIP Code was expanded from 5 digits to 9 and then to 11, with each digit indicative of the address location.

Census tracts have well known/exact boundaries. ZIP codes are groups of lines whose exact structural definition is not officially established.

A ZIP Code is a 5-digit number that specifies an individual destination post office or mail delivery area. ZIP Codes determine the destination of letters for final sorting and delivery. Each ZIP Code designates a collection of delivery routes used by mail carriers and areas serviced by the USPS.

In Canada, the equivalent is called a postal code. Both are used to identify and group addresses by geographical area to sort and deliver mail. But postal codes are used for more than just mailing letters.