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I have a data set with ZIP +4 codes, and ideally, I'd like to map them (their centroids) as points. I'm not interested in their boundaries (since they're not really geographies anyway). Does anyone know of a resource that has point data for ZIP + 4s? Or might there be a better way to go about mapping this type of data?

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Nokia/NavTeq and TomTom both have datasets for sale/use that are Zip+4 points. These can be wildly inaccurate for many uses since a +4 record represents a Sector and Segment of a postal delivery route and can include several streets or miles of a single route.

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