United States Postal Service (Zip codes/Postal codes)

It is a code used for mail delivery by USPS (United States Postal Service).

For Example (A complete address):

Academy of Motion Picture Arts and Sciences
8949 Wilshire Boulevard
Beverly Hills, California 90211
United States of America (USA)

The above address is in Beverly Hills, California.  The ZIP code is 90211.

For Example (known zip codes for major cities):

02115 (Boston), 10001 (New York City), 19103 (Philadelphia), 20008 (Washington, D.C.), 30303 (Atlanta), 33130 (Miami), 40202 (Louisville), 60601 (Chicago), 63101 (St. Louis), 77063 (Houston), 80202 (Denver), 94111 (San Francisco), 98101 (Seattle), and 00601 (Puerto Rico).

What is in a ZIP code?

ZIP code =
ZIP + 4 numbers

The first digit of the ZIP code is allocated as follows:

0 = Connecticut (CT), Massachusetts (MA), Maine (ME), New Hampshire (NH), New Jersey (NJ), Puerto Rico (PR), Rhode Island (RI), Vermont (VT), Virgin Islands (VI), Army Post Office Europe (AE), Fleet Post Office Europe (AE)

1 = Delaware (DE), New York (NY), Pennsylvania (PA)

2 = District of Columbia (DC), Maryland (MD), North Carolina (NC), South Carolina (SC), Virginia (VA), West Virginia (WV)

3 = Alabama (AL), Florida (FL), Georgia (GA), Mississippi (MS), Tennessee (TN), Army Post Office Americas (AA), Fleet Post Office Americas (AA)

4 = Indiana (IN), Kentucky (KY), Michigan (MI), Ohio (OH)

5 = Iowa (IA), Minnesota (MN), Montana (MT), North Dakota (ND), South Dakota (SD), Wisconsin (WI)

6 = Illinois (IL), Kansas (KS), Missouri (MO), Nebraska (NE)

7 = Arkansas (AR), Louisiana (LA), Oklahoma (OK), Texas (TX)

8 = Arizona (AZ), Colorado (CO), Idaho (ID), New Mexico (NM), Nevada (NV), Utah (UT), Wyoming (WY)

9 = Alaska (AK), American Samoa (AS), California (CA), Guam (GU), Hawaii (HI), Marshall Islands (MH), Federated States of Micronesia (FM), Northern Mariana Islands (MP), Oregon (OR), Palau (PW), Washington (WA), Army Post Office Pacific (AP), Fleet Post Office Pacific (AP)

The next 4 numbers: Secondary Regional Prefixes and Local ZIP codes

The next two digits represent the Sectional Center Facility, and the fourth and fifth digits represent the area of the city (if in a metropolitan area), or a village/town (outside metro areas).

Unique ZIP code

Unique ZIP codes are used for governmental agencies, universities, businesses, or buildings that receive such extremely high volumes of mail that they need their own ZIP codes.

For Examples:

20505 for the Central Intelligence Agency in Washington, D.C.
81009 for the Federal Citizen Information Center
Headquarters of Wal-Mart (72716)
The Empire State Building (10118)

Source: http://en.wikipedia.org/wiki/ZIP_code

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