A ZIP code number is a five-digit postal code assigned to an area in the United States or its overseas military stations. ZIP is an acronym for Zone Improvement Plan. More »

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As all ZIP codes in the United States have five digits, U.S. ZIP codes range from 00000 to 99999. One example of a notable ZIP code is 20505 for the Washington, DC CIA office, which due to high mailing volume, is uniquel... More »

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Non-mandatory ZIP codes were introduced to the United States in 1963. Robert Moon, a postal inspector with the United States Postal Service, proposed the ZIP code system as early as 1944. More »

There is not a single postal code for Ottawa, Ontario in Canada since the code varies by town. Each postal code starts with three characters containing the letter "K" followed by a number between 0 and 4 and then another... More »

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There is no single postal code for the United Kingdom. Each area of the country has different postal codes that designate a specific area with a number of addresses. More »

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In order to find the postal code for a specific address within the United States, online visitors to the United States Postal Service website can use the Look Up a ZIP Code web tool. It is accessed through the Quick Tool... More »

An easy way to find a nine-digit ZIP code is to go to USPS.com and search for the desired address in the Look Up a ZIP Code tool. The link for this tool can be found in the Quick Tools menu on the left. More »