The Zip Code: A brief history

A ZIP Code is a postal code used by the United States Postal Service (USPS). Initially, the first postal zoning system had been developed during WWII, and the zip code was only a two-digit number: the first denoted the city, and the second denoted the state. But as the need for delivery expanded, so did the concept of the zip code. The term “ZIP” is short for “Zone Improvement Plan.”

zip codes united states


Introduced in 1963, the basic format consisted of five digits. Over time, the ZIP+4 was added to add more granularity to the zip code to denote specific locations, even buildings for postal workers to deliver; it included the five digits of the ZIP Code, followed by a hyphen and four digits that designated a more specific location. At the time of introduction, the 2-digit state abbreviations were also implemented to create space on the address labels for the new codes.

zip-code

The United States Postal Service (USPS) has segmented the country into 10 ZIP Code areas. The five-digit ZIP Codes begin with a digit from 0-9 that represents a region of the United States. The first digit indicates a geographical area of the country, beginning with zero in the northeastern states and ending with nine in the west. The next two numbers indicate regional areas and the final two, specific Post Offices or postal zones in larger cities. ZIP Codes are not granted or assigned by any specific border that you find on a traditional US map.


While most people think of ZIP codes as covering a specific area of geography, ZIP Codes can also represent just one location such as a building. ZIP code data is an integral part of business operations in the United States. It’s an important parameter for sending mail, managing fraud detection or researching demographic information. The ZIP codes help postal service providers to designate delivery routes.

ZIP Code by Area Code List

201202203205
206207208209
210212213214
215216217218
219220223224
225228229231
234239240248
251252253254
256260262267
269270272276
279281301302
303304305307
308309310312
313314315316
317318319320
321323325326
330331332334
336337339340
341346347351
352360361364
380385386401
402404405406
407408409410
412413414415
417419423424
425430432434
435440442443
445458463469
470475478479
480484501502
503504505507
508509510512
513515516517
518520530531
534539540541
551559561562
563564567570
571573574575
580585586601
602603605606
607608609610
612614615616
617618619620
623625626628
629630631636
640641646650
651657659660
661662667669
670671678680
681682684689
691701702703
704706707708
712713714715
716717718719
720724725726
727731732734
737740743747
754757760762
763765769770
772773774775
779781785786
787801802803
804805806808
810812813814
815816817818
820828830831
832838839843
845847848850
854856857858
859860862863
864865870872
878901903904
906907908909
910912913914
915916917918
919920925928
929930931934
936937938939
940941947949
951952954956
959969970971
972973978979
980984985986
989