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A letter or parcel without a zip code is highly likely to never reach its intended destination. This is because of how the US Postal Service's automated systems process residential addresses.

The answer is yes, ZIP codes can have an effect on behaviour. People who live in different ZIP codes may be subjected to varying environments, resources, and opportunities, all of which have the potential to influence their behaviour in a variety of different ways.

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

ZCTAs or ZIP Code Tabulation Areas were created by the U.S. Census Bureau and are generalized representations of ZIP Codes that have been assigned to census blocks. Therefore, ZCTAs are representative of geographic locations of populated areas. In most cases, the ZCTA will be the same as its ZIP Code.

Census tracts are small, relatively permanent geographic entities within counties (or the statistical equivalents of counties) delineated by a com- mittee of local data users. Generally, census tracts have between 2,500 and 8,000 residents and boundaries that follow visible features.

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.

Nominal variables are also called categorical variables or factors. Nominal variables may be represented by numbers. If so, these numbers are used merely as labels and are not subjected to arithmetic operations. ?Zip Code? is a nominal variable whose values are represented by numbers.

ZIP Codes are numbered with the first digit representing a certain group of U.S. states, the second and third digits together representing a region in that group (or perhaps a large city) and the fourth and fifth digits representing a group of delivery addresses within that region.

A ZIP Code is a postal code used by the United States Postal Service (USPS). Introduced on July 1, 1963, the basic format consisted of five digits. In 1983, an extended ZIP+4 code was introduced; it included the five digits of the ZIP Code, followed by a hyphen and four digits that designated a more specific location.

Standard US ZIP codes The standard ZIP code notation used by the United States Postal service uses five digits to identify a delivery area. An example of a standard US ZIP code is 90210.