> please look at the site
> http://www.zipmap.net/
>
> the web page displays a polygon overlaying on a google map with a text
> of the zipcode.

This map displays tiles from a private tileserver which contain
coloured polygon shapes and text labels, all rendered in the tiles.
Example tile
http://ts2.usnaviguide.com/tileserver.pl?X=9649&Y=12314&Z=15&T=a5540a7a34

There is nothing to stop you creating your own similar tileserver and
using it with API v3, if that is really what you want to do.

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