Zip codes are postal codes to make sure the mails reach the right destination. The zip code has to be mentioned by the sender in the postal address to make it more precise and clear for the postal department. A zip code includes five numeric digits of the zip code like 66417, a hyphen followed by four digits that determine a specific location. For example 66417-2361. Therefore, it is Zip +4 and the set of numbers depend is different for different countries.
The U.S Postal Service termed Zip Code as a trademark. Later in 1943, the United States Post Office Department stated the postal zones for bigger cities. Along with the zip code two letter state abbreviations also came into existences.
In a Zip code, the first digit relates to a particular group of US state, the second and the third digit relates to a particular region. The fourth and the fifth digit relate to a delivery address of a particular region. The Zip codes for the following states are:-
0: Massachusetts, Connecticut, New Jersey, New Hampshire, Puerto Rico, Maine, Vermont, Rhode Island, Army Post Office Europe, Virgin Islands and Fleet Post Office Europe.
1: New York, Delaware and Pennsylvania
2: Maryland, Virginia, South Carolina, North Carolina, District of Columbia and West Virginia.
3: Georgia, Florida, Mississippi, Alabama, Fleet Post office Americas and Army Post Office Americas.
4: Kentucky, Ohio, Indiana and Michigan
5: North Dakota, Montana, South Dakota, Iowa, Wisconsin and Minnesota.
6: Kansas, Nebraska, Missouri and Illinois.
7: Texas, Louisiana, Arkansas and Oklahoma.
8: New Mexico, Arizona, Utah, Idaho, Nevada, Colorado and Wyoming.
9: California, Hawaii, Alaska, Marshall Islands, American Samoa, Federated States of Micronesia, Palau, Northern Mariana Island, Washington, Fleet Post Office Pacific and Army Post Office Pacific.