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ZIP & ZIP+4 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.

A ZIP Code is a 5-digit number that specifies an individual destination post office or mail delivery area. ZIP Codes determine the destination of letters for final sorting and delivery.

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.

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.

For example, 40202 is in Louisville, 50309 in Des Moines, 60601 in Chicago, 63101 in St. Louis, 77036 in Houston, 80202 in Denver, 94111 in San Francisco, 98101 in Seattle, and 99950 in Ketchikan, Alaska (the highest ZIP Code).

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.

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.

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.