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The post office credits Moon with only the first three digits of the ZIP Code, which describe the sectional center facility (SCF) or "sec center". An SCF is a central mail processing facility with those three digits.

While there isn't a coveted 00001 zip code hiding out anywhere in the U.S. (if there was we'd hope it was for the mailroom at the White House), there is most definitely a lowest number in use. Alas, the lowest zip code isn't a single digit or in possession of the Supreme Court or other such group.

Your ZIP+4 is a basic five-digit code with four digits added as an extra identifier. It helps to identify a geographic segment within the five-digit delivery area, such as a city block, a group of apartments, an individual high-volume receiver of mail, or a post office box.

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.

The post office credits Moon with only the first three digits of the ZIP Code, which describe the sectional center facility (SCF) or "sec center". An SCF is a central mail processing facility with those three digits.

USA ZIP Code Areas - Three-Digit represents the first three digits of a ZIP Code.These digits, in conjunction with the first digit, represent a sectional center facility or a mail processing facility area.

ZIP codes are numbered with the first number representing a certain group of U.S. states. The second and third numbers represent a region in that group of states or, in some cases, a large city.Often, the biggest city in a prefix is given a zip code ending in 01.