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Unique ZIP codes generally are used by large organizations, government buildings, universities or large medical facilities. For these cases, the USPS would drop off all the mail at one single location, and then the mail recipients would distribute it to the necessary parties internally.

Zip codes: Use the USPS Zip Code Lookup tool, or search Google or Bing. Find area codes: Type the city and state name, along with area code, into Google, Bing, Yahoo, or Wolfram Alpha. Or, use a specialized website like Area Codes, Country Codes, LincMad, or AllAreaCodes.com.

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.

First of all, ZIP codes do not generally correspond to city and town boundaries, so having a ZIP code associated with a city is no guarantee that an address is actually located in that city. Second of all, ZIP codes actually have multiple names associated with them.

In Canada, the equivalent is called a postal code. Both are used to identify and group addresses by geographical area to sort and deliver mail. But postal codes are used for more than just mailing letters.

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 most complete ZIP Code is a nine-digit number consisting of five digits, a hyphen, and four digits, which the USPS describes by its trademark ZIP+4. The correct format for a numeric ZIP+4 code is five digits, a hyphen, and four digits.