For example: http://g.co/maps/2dpkj has a scheme around the zip code area. I understand that this is not available through the API, but where else can I get this data, for example, in KML format.
This is for UK data
Most likely, Google has a license agreement with Ordnance Survey that allows them to use Code Points with Polygons data - I think they then did some data processing to create a KML file. Depending on your GIS skills and ability to read the source file (ESRI / MapInfo), you should be able to do the same.
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/boundary/uk?postal-sector=ab16 9&postal-unit=ab16 9uw
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