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The first digit in a ZIP code represents a defined group of U.S. states. The second and third digits represent a region in that group, such as a large city. To send mail, only the first five digits of the ZIP code are required.

Some variables, such as social security numbers and zip codes, take numerical values, but are not quantitative: They are qualitative or categorical variables.

As new research from the Census Bureau and researchers at Harvard and Brown universities shows, children from places that are economically disadvantaged tend to have worse outcomes as adults. People who earn less also tend to die sooner.

As of 1963, zip codes' numbers are determined by a few factors: the area, the regional postal facility and the local zone. 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.

That five-digit zip code is one of the key items data brokers use to link a wealth of public records to what you buy. They can figure out whether you're getting married (or divorced), selling your home, smoke cigarettes, sending a kid off to college or about to have one.

A ZIP Code indicates the destination post office or delivery area to which a letter will be sent for final sorting for delivery. ZIP Codes designate delivery routes used by mail carriers and areas serviced by the USPS.

With a name and address, a thief can change your address via U.S. Postal Service and redirect mail to their address of choice, Velasquez says. With access to your financial mail, the thief may intercept bank statements and credit card offers or bills, then order new checks and credit cards.

Zip codes help tell postal workers where a letter or package is going. In the United States, ZIP codes are a type of postal code. Individuals who mail letters or packages via the United States Postal Services (USPS) are required to write the code as part of the address.

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 USPS ZIP Codes identify the individual post office or metropolitan area delivery station associated with mailing addresses.

Where you live is one of the most significant components of overall health outcomes and life expectancy. Up to 60% of your health is determined solely by your zip code.