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Current postal code range in the United StatesThe lowest postal code area is 00001. This is the N Dillingham area in Alaska.

Stores want your ZIP code because, combined with your name from your credit card, they can use it to find out other information about you from commercial databases, like your full mailing address.So essentially, retailers are seizing the opportunity to potentially make money by asking for your ZIP when you checkout.

If you want to improve the chances that the letter will make it to its destination quickly, you should use the five-digit ZIP code plus the four additional numbers that are specific to the area. To format, write the ZIP code with a hyphen afterward and then the four additional numbers will immediately follow that.

11111 is not a valid 5 digit ZIP Code, but there are valid ZIP Codes that start with 111: 11101, 11102, etc. Once position 28 was changed to Y, then MSP considered 11111 as an Invalid zip, because it looked at all 5 digits.

Residential addressesYou will need to write the name of the state in which the city, town or village you are sending to is located.You will also need to add a five-digit ZIP code (postal code).Write the city/town/village name, the state and the ZIP code on the same line, as shown above.

It doesn't exist. In fact, the highest real zip code is 99950, for Ketchikan, Alaska. Still, if you scour your database, there's a good chance you'll find more than a few 99999 zip codes. Most organizations find that it's been entered as a placeholder in their shipment database.

USPS.com. To find a zip code with USPS.com, you need to fill in the fields with your USA street address, city, and state. Then click Find and you'll get your postal code.