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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/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/article/zip-codes-washington-17102e866e7578a

As of 2015, some of the zip codes in the state of Washington include 98001, 98002, 98003 and 98022. These zip codes are for various cities in King County.

www.reference.com/article/zip-code-maps-b3914f1bb994ac46

Some websites that offer free ZIP code maps are ZipMap.net and UnitedStatesZipCodes.org. A ZIP code map separates each ZIP code area on a map with varying colors.

www.reference.com/article/u-s-zip-code-map-b411ade92195036e

A ZIP code map is an area map of the United States outlined in zones representing their respective U.S. Postal Service ZIP code. The ZIP code is a non-repeating numeric system with nine digits used for identifying geographic regions and used by the USPS to locate addresses for mail delivery.

www.reference.com/article/denver-area-zip-codes-e7c8a5a93eabf690

The zip codes of the Denver metro area all fall between 80001 and 80603. Apart from the city of Denver itself, this area also includes 40 smaller cities, among them Lakewood, Arvada, Thornton, Littleton and Aurora.

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/surrounding-zip-codes-specific-zip-code-663680fefc703b7a

One of the easiest ways to find surrounding zip codes to a specific zip code is to visit the Zip Code Finder and Boundary Map at http://maps.huge.info/zip.htm. This site is an excellent resource to find out which zip codes surround another zip code of your own specification.

www.reference.com/article/zip-codes-virginia-92358ec374169a89

ZIP codes in the state of Virginia all begin with the number 2 and range from 20101 to 24658. The lower number ZIP codes are located around the densely populated cities in the northeast and get larger as they move into the southwestern regions of the state.