One billion, from 00000-0000 through 99999-9999
Even before you get to the "plus 4" part, Kansas has a couple thousand 5-digit ZIP Codes, each of which could have as many as 10,000 ZIP+4 codes. You will have to be wayyyy more specific in your question.
As far as I can tell, all 5 digit numbers are potential zip codes, so there are 99999 + 1 potential zip codes, or 100,000. Many of these are not actually is use.
Zip codes are American postal codes designed to "zip" the mail faster. They consist of a 5 digit number and then a plus four number.
27 zip codes
The United States uses ZIP+4 and ZIP+6 postal codes, but not ZIP+2.
The United States uses ZIP+4 and ZIP+6 postal codes, but not ZIP+2.
There are approximately 43000 zip codes in the USA
33 zip codes
There are 9 digits in a ZIP+4 code, which gives you one billion possible codes. Obviously, most of those are not used, but each ZIP+4 code serves at most one side of one block of one street, so there are millions of them.
There are approximately 43000 zip codes. Number of ZIP codes periodically changes. For example, around 200 zip codes were added in the U.S. in 2006-2007.
OK. States don't have Zip Codes. Cities have Zip Codes. You can get the complete list of ZIP codes in California under different Cities from here: http://www.zip4all.com/california/ca/ .
Arlington uses the 76000 to 76099 ZIP Codes.