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So with V10 of Tableau, you can now do a cross DB join with a data source that has all of the zip codes in the US such as - Free Zipcode Database | Free Zip Code Database
So in the attached example, I have used this as a primary data source and superstore data as a second data source and I have joined them on Zip code. Now all of the Zips appear and you can show sales (where they occur) by color for each zip.
I hope this helps.
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