Use our interactive map, address lookup, or code list to find the correct 5-digit or 9-digit (ZIP+4) code for your postal mails destination.
The map of the first digit of zip codes above shows they are assigned in order from the north east to the west coast. A ZIP Code is a 5-digit code that identifies a specific geographic delivery area. ZIP Codes can represent an area within a state (an area that may or may not cross county boundaries), an area that crosses state boundaries (an unusual condition), or a single building or company that has a very high mail volume.

The first digit of a USA ZIP code generally represents a group of U.S. states.
Cities by ZIP Code™ For more rapid delivery, please use the recommended or recognized city names whenever possible for this ZIP Code ™.

The first 3 digits of a ZIP code determine the central mail processing facility, also called sectional center facility or "sec center", that is used to process and sort mail. ZIP codes for the 50 states of the US.