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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.

Primary state prefixes. 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.

A United States postal code, for example, might be either five digits or five digits followed a hyphen (dash) and another four digits (12345-1234). If you are validating US postal codes, allow for both conditions. The following rule validates a field that can be five digits, five digits + dash + 4 digits, or blank.

The standard ZIP code notation used by the United States Postal service uses five digits to identify a delivery area. An example of a standard US ZIP code is 90210.

Look Up a ZIP Code ? By Address. Enter a corporate or residential street address, city, and state to see a specific ZIP Code?. Find by Address. By City and State. Enter city and state to see all the ZIP Codes? for that city. Find by City & State. Cities by ZIP Code? Enter a ZIP Code? to see the cities it covers.

The ZIP in ZIP Code stands for Zone Improvement Plan, and it was introduced July 1, 1963, as part of a larger Postal Service Nationwide Improved Mail Service (NIMS) plan to improve the speed of mail delivery.

ZIP Codes are 5-digit numbers developed by the United States Postal Service to represent individual post offices across the United States. "ZIP Code" is the name of the postal code system for the United States. Like the US, most countries have their own postal code system names.

ZIP codes are five digits long. The first digit is assigned to a broad geographical area of the United States, ranging from zero in the Northeast to nine in the West. The next two digits pinpoint population concentrations and sectional centers accessible to common transportation networks.

Type any U.S. address or place in the Search places box above the mapCheck the Show ZIP Code labels checkbox in the lower left corner of the map to see ZIP Code labels on the map.Click the Colorize button in the upper left corner of the map to color in the ZIP Code areas (especially useful in busy metro areas)More items...?

United States ZIP codes are five numerical digits long. ZIP+4 codes, also known as add-on or plus-four codes, include four additional digits that identify a geographic segment within a ZIP code delivery area. The first digit in a ZIP code represents a defined group of U.S. states.