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www.reference.com/article/zip-4-code-4a521e40f5e03dd

ZIP+4 codes are extensions to original five digit zip codes that include more specific geographic locations. They are designed to aid in the sorting and delivery of mail.

www.reference.com/article/ways-look-up-zip-code-5bc45c2c34dc5346

As of 2015, ZIP codes can be looked up at USPS.com, UnitedStatesZIPCodes.org and ZIPcode.org. All three websites offer search tools to find ZIP codes for a given location.

www.reference.com/history/did-zip-codes-start-ea6ead85e9e1c1b

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.

www.reference.com/article/difference-between-normal-zip-codes-zip-4-codes-d81550218f80a5c5

The difference between normal ZIP codes and ZIP+4 codes is that ZIP+4 codes contain four extra digits that more accurately define the delivery area. The extra digits are not required, but they do help in routing mail more efficiently.

www.reference.com/business-finance/businesses-zip-code-b1f2229fe9cf5ee6

Several websites, including Yellowpages.com, Manta.com and MerchantCircle.com, provide online search tools for locating businesses by ZIP code. To find businesses by ZIP code using these search tools, enter the ZIP code and additional information about the business into the search boxes.

www.reference.com/article/zip-codes-united-states-4b6c11bed630de48

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 uniquely used for that one address.

www.reference.com/article/list-zip-codes-61a46891e1e947f8

A list of ZIP codes is available at UnitedStatesZIPCodes.org, which provides full lists of ZIP codes for each state in the United States. Types of ZIP codes listed include standard, PO boxes, military and single-address ZIP codes.

www.reference.com/article/zip-codes-florida-a59694bf84f11c3c

There are more than 500 ZIP codes in Florida, and all of them begin with the numbers 32, 33 or 34. The 32 ZIP codes cover northern areas such as Jacksonville and Tallahassee. The 33 ZIP codes cover cities such as Miami and Tampa, and the 34 ZIP codes cover smaller coastal cities.

www.reference.com/article/way-location-based-zip-code-6377d282a3c7a22a

The United States Postal Service has a search portal that shows towns where post offices are located. Enter the ZIP code, restrict the search area to one or five miles, and then press or click "Search."

www.reference.com/article/popular-zip-codes-texas-2047c99569aa38ad

77005, 77024, 78746, 77094 and 76034 are some popular ZIP codes in Texas, as of 2015. The ZIP codes correspond to Houston, West Lake Hills in Austin, the Katy area, the Energy Corridor District and Colleyville.