If multiple zip codes are needed, it would be better to go directly to the post office to consult their zip code directory. Arranged by states, then cities, then streets, it will furnish the necessary codes.
If you have access to the internet you can go to the United States Postal Service web site and look up the zip code for an address. If you don't have access to the internet, or you don't feel comfortable using that site, you can call your local post office and they can give you the correct zip code.
That information can be gotten through accessing the United Sates Postal System Internet web-site. If you are determined to use the phone a call to your local post office should get you the same information