There is also another type of postal code, the ZIP + 4 code. According to unitedstateszipcodes.org, the ZIP + 4 was established in 1983 and identifies an even more specific location within a ZIP code.

On July 1, 1963, the U.S. Post Office Department introduced the ZIP code program to get a handle on the heaping surplus of mail. Today, those five digits represent much more for American society.

Fact checked by Vikki Velasquez You may have noticed that, lately, your online shopping packages are arriving a little earlier—or later—than expected. Why? As of April 1, 2025, the U.S. Postal Service ...

Here’s how you can convert your postal code into a ZIP code: Check the postal card associated with your credit card’s billing address (for example, B1C 2D3). Take the three numbers in your ...

When prompted for your ZIP code, enter the three digits from your postal code, followed by “00.” For example, if your postal code is M4B 1G5, your credit card ZIP code would be 41500 ...