California Zip Codes

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California Zip Codes start with the digit 9, which is also the first digit of the zip codes of American Samoa (AS), Alaska (AK), Hawaii (HI), Guam (GU), Federated States of Micronesia (FM), Marshall Islands (MH), Oregon (OR), Northern Mariana Islands (MP), Washington (WA), Palau (PW), Fleet Post Office Pacific (AP) and Army Post Office Pacific (AP).

About California Zip Codes
Since 1963, ZIP codes are a method of postal codes implemented by the United States Postal Service (USPS). The expression ZIP is a short form for Zone Improvement Plan. It is suitably printed in capital letters and was selected to advise that the mail goes more expeditiously, and thus more swiftly, when the dispatchers are mentioning the code in the postal address. The fundamental arrangement comprises of five decimal numeric digits. An expanded ZIP+4 code, launched in the 1980s, contains the five digits of the ZIP code, a hyphen, and four additional numbers that ascertain a more accurate position than the ZIP code only. The expression ZIP code was initially listed as a servicemark (a category of trademark) by the USPS, however its listing has since lost validity.

California Zip Codes begin with the digit 9. The counties have separate area codes. In an online database, you can enter the name of the city or county and get its zip or area code.


Due to problems of uncertainty and deficiency of identity, some cities like Signal Hill have effectively requested the USPS to alter ZIP code borders or form new ZIP codes in order that the cities turn into the default location name for addresses within the ZIP code.

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