: In some cases, people mistakenly combine parts of a full 9-digit code (e.g., 155XX-834X).
If you are looking for a location, you might be thinking of one of these similar ZIP codes in : 155834 zip
: Identify a specific local post office or delivery area within that city or county. Common Reasons for "Invalid" ZIP Codes : In some cases, people mistakenly combine parts
: This ZIP code encompasses the borough of Castle Shannon and parts of the Pittsburgh neighborhood of Overbrook. It is a more urban/suburban area within Allegheny County. Understanding ZIP Code Structure : In some cases
The digits in a ZIP code are not random; they follow a specific geographic logic determined by the U.S. Postal Service (USPS) :