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This question already has an answer here:

From where can I download WKT files for US zip codes?

I need to plot zip code boundary on a map using OpenLayers,

marked as duplicate by mkennedy, Brad Nesom, whuber May 27 '14 at 23:06

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    It is unlikely anybody would store spatial data in such an inefficient format, but of course once you have obtained the data in some format you can easily convert it to WKT. Perhaps, then, you will be satisfied with the answers at gis.stackexchange.com/questions/5114/…, which show where to find Zip code spatial data. – whuber Jun 12 '13 at 12:33

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