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Zip codes: Use the USPS Zip Code Lookup tool, or search Google or Bing. Find area codes: Type the city and state name, along with area code, into Google, Bing, Yahoo, or Wolfram Alpha. Or, use a specialized website like Area Codes, Country Codes, LincMad, or AllAreaCodes.com.

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.

Zip codes: Use the USPS Zip Code Lookup tool, or search Google or Bing. Find area codes: Type the city and state name, along with area code, into Google, Bing, Yahoo, or Wolfram Alpha. Or, use a specialized website like Area Codes, Country Codes, LincMad, or AllAreaCodes.com.

ZIP codes are a type of postal code used by the United States Postal Service to route mail. First introduced by the Post Office Department in 1963, ZIP stands for Zone Improvement Plan, and was initially established to help the USPS deliver packages. Today it is used to ship almost anything to an address.

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.

The term Postal Index Number (PIN) is popularly known as PIN Code/Postal Code in India. It is a code in the post office number of the postal code system which is used in India Post for segregating the mails. The PIN code consists of six digits.

These last 4 digits represent specific delivery routes within delivery areas. This extra detail means an even more precise matching to a more granular level. It could represent a handful of houses on one side of a street, or even a single building that receives a high volume of mail.

A United States postal code, for example, might be either five digits or five digits followed a hyphen (dash) and another four digits (12345-1234). If you are validating US postal codes, allow for both conditions. The following rule validates a field that can be five digits, five digits + dash + 4 digits, or blank.