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ZIP Codes are numbered with the first digit representing a certain group of U.S. states, the second and third digits together representing a region in that group (or perhaps a large city) and the fourth and fifth digits representing a group of delivery addresses within that region.

ZIP Codes are numbered with the first digit representing a certain group of U.S. states, the second and third digits together representing a region in that group (or perhaps a large city) and the fourth and fifth digits representing a group of delivery addresses within that region.

ZIP codes are not as geographically scattered as area codes in the US, but they are not a coordinate system. The only exception is that the ZIP+4 codes are sub-sections of the larger ZIP code. You can assume that any ZIP+4 codes that have the same ZIP code are close to each other. Hopefully has other useful info.

If prompted for your ZIP code, just enter the three digits of your postal code plus two zeros. So for example, if your postal code is A2B 3C4, the 5-digit number you should enter is 23400.

ZIP+4 Codes (or ZIP Plus 4 Codes) are the final 4 digits of a full nine-digit ZIP Code. The 9-digit ZIP Code consists of two sections. The first five digits indicate the destination post office or delivery area. The last 4 digits represent specific delivery routes within delivery areas.

The ZIP+4 code is used and assigned by the United States Postal Service (USPS) for routing purposes. The final 4 digits are not required for delivery of your mail and may change frequently.Five-digit ZIP codes also change, but they do so infrequently.

Also called plus-four codes, add-on codes, or add-ons, the ZIP+4 code starts with the standard five-digit ZIP Code. The four extra numbers are added after a hyphen to complete the ZIP+4. So what do the extra numbers mean? These last 4 digits represent specific delivery routes within delivery areas.