yes of course I know people with 3 and 2 digit addresses
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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.
10*9*8*7*6=30,240
ZIP Code began on July 1, 1963,
There are zip codes and zip+4 codes for every location in the US. To find a zip code for a location, you can use either of the related links.
Go to usps.com, click 'Find a ZIP code' and type-in your address.