Introduction to US ZIP Code: US ZIP code format, where do I need to use a ZIP code?

The Zip Code is a code used in the United States, consisting of letters and numbers. Each state has its own letter code, and the zip code is composed of 9 digits (full zip code), mainly to facilitate the fast and efficient delivery of packages by the United States Postal Service (USPS). The first 5 digits of US ZIP codes were first used in 1963. At the time, many courier companies used zip codes to sort packages for easy transportation to different locations. In addition, the courier company will also calculate the time and distance cost according to the zip code, which is convenient for charging. The format for US ZIP codes is: CA-12345-6789. The first two letters represent the state, the middle 5 digits represent the zoning center of the state, and the last 4 digits are the detailed street address. The system will identify where the specific location is based on the zip code, so that the package can be sorted and delivered quickly. For some metropolitan cities, the classification of zip codes is relatively detailed, which requires you to check carefully on the website of the US zip code, usually only need to enter the detailed address. For example, Denver, the code is 80201 to 80239, then the zip code can be filled with any number from 80201 to 80239. Where do I need to use a US ZIP code? For Chinese, when sending express from foreign countries to the United States, it is necessary to add the correct zip code. Some places may have the same place name, but you can't go wrong with a zip code. When shopping on a website in the United States, it is generally required to fill in a detailed address and zip code, which is all for the convenience of express delivery.