What is the zip code of Washington, DC, United States?

Washington, D.C. ZIP Code is 20237.

The ZIP Code is a postal code used by the United States Postal Service (USPS) and is often written in uppercase letters as ZIP. ZIP is short for Zone Improvement Plan. ZIP is short for Zone Improvement Plan, which implies that mail can be delivered to its destination more efficiently and quickly.

The basic ZIP number consists of five numbers, and then four additional numbers are added so that mail can be delivered more accurately to its destination. The added ZIP number is known as "ZIP+4." The ZIP number was once registered as a trademark by the U.S. Postal Service, but its registration has since expired.

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In addition to the USPS, other commercial mailing companies such as FedEx, UPS?(United Parcel Service) and DHL use ZIP numbers for internal operations. This eliminates the need for customers to use other wayfinders, such as the IATA number at the destination airport or train station.

The ZIP number is not only used to track the location of a piece of mail, but it also provides geographic data for the United States. For example, the U.S. Census Bureau continuously tracks the latitude and longitude of the center of every ZIP code, and this information is sold by many other companies. This information is often used in direct mail campaigns called "ZIP Code Marketing Programs".

Cashiers in stores sometimes ask for the ZIP number of a customer's address in order to gather information about the customer's shopping patterns. Companies or specialists analyze this information to determine where to open new businesses. Finally, ZIP code information is also used to analyze geographic factors.

References:

U.S. ZIP Codes - Baidu Encyclopedia