Source for zip code / ZCTA JSON boundaries?

We've been using a file we downloaded from, but there are a lot of errors due to missing zip codes, incorrect boundaries, etc.  I know that Tableau has built-in zip code boundaries that are pretty good.  Has anyone found a better source?  Perhaps using something from ArcGIS?

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  • The census provides this data here:

    There's also extensive material available online about why boundaries for ZIP boundaries aren't necessarily super accurate (as ZIP codes by their nature aren't defined geographic regions, but rather are postal routes). You'll notice that in the dataset, a lot of boundaries aren't even polygons, but some are just points. This is because some origin / destination points for mail (such as distribution centers or post offices) have their own ZIP code. A lot of these ZIP codes for specific point locations won't appear in the dataset at all. 

    ArcGIS has a more comprehensive dataset, but you have to pay for access typically, and the data isn't as usable in third party applications out of the box. 

    I actually built a mapping utility around these boundaries here as a personal project:

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  • Hari said it best! I have been using the 2010 census shapefile, but Hari's looks newer. Time to update!

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