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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.

The 9-digit ZIP Code consists of two sections. The first five digits indicate the destination post office or delivery area. The last 4 digits represent specific delivery routes within delivery areas. ZIP plus 4 codes assist the USPS in effectively sorting and distributing mail.

There are four primary types of ZIP codes: PO Box, Unique, Military, and Standard. PO boxes are located at the post office itself; unique codes refer to individual addresses; US military bases overseas have a domestic mailing address; and standard codes designate everything else (i.e. the normal ones).

Residential addressesYou will need to write the name of the state in which the city, town or village you are sending to is located.You will also need to add a five-digit ZIP code (postal code).Write the city/town/village name, the state and the ZIP code on the same line, as shown above.Nov 1, 2017

USA ZIP Code Areas - Three-Digit represents the first three digits of a ZIP Code.These digits, in conjunction with the first digit, represent a sectional center facility or a mail processing facility area.

The Zone Improvement Plan, or ZIP code system of addressing, organized mail delivery by dividing the country into 10 regions and assigning five digits increasing in specificity: from region to large sorting centers to smaller post offices.

United States ZIP codes are five numerical digits long.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.