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The most complete ZIP Code is a nine-digit number consisting of five digits, a hyphen, and four digits, which the USPS describes by its trademark ZIP+4. The correct format for a numeric ZIP+4 code is five digits, a hyphen, and four digits.

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.

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.

You've entered your address information incorrectly. Make sure your city, state, and zip codes all match and your address is spelled correctly.

Include leading characters in postal codes For example, you can use zeros or dashes to display a postal code as follows: 0000000 98052 or ------- 98052.

The most complete ZIP Code is a nine-digit number consisting of five digits, a hyphen, and four digits, which the USPS describes by its trademark ZIP+4. The correct format for a numeric ZIP+4 code is five digits, a hyphen, and four digits.

Residential addresses You 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.