ZIP Code guides for United States
How ZIP codes are structured, what the parts mean, and how to find the right one. Or skip the reading and detect your ZIP code now.
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ZIP Code vs ZIP+4: What the Extra Four Digits Actually Do
Every US address has a five-digit ZIP code and almost every one also has four more digits behind it. Here is what that longer form encodes, when it is worth using, and why you almost never need to type it.
GetMyPostalCode Editorial ·
ZIP Code vs Area Code: Why They Do Not Line Up
Both are numbers attached to where you are, both get used as a proxy for location, and they have nothing to do with each other. Two different organisations built them, sixteen years apart, for unrelated reasons.
GetMyPostalCode Editorial ·
Why ZIP Code Fields Break: Seven Common Errors
A ZIP code is five characters and still manages to be one of the most reliably broken fields on the web. These are the failures worth knowing about, whether you are filling a form in or building one.
GetMyPostalCode Editorial ·
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