[Talk-us] Fwd: Postal Code Extract

Carl Anderson carl.anderson at vadose.org
Fri Aug 30 22:49:45 UTC 2013

If you are looking for the correct ZIP code by address you should acquire
the USPS ZIP4 product
The Census ZCTA5 data is pretty good to help determine the predominant ZIP
code in areas.  It misses singleton addresses but you can pick up many of
them by looking at the Census TIGER edge file zipl and zipr.

On Aug 30, 2013 6:35 PM, "Richard Welty" <rwelty at averillpark.net> wrote:

>  On 8/30/13 6:12 PM, John F. Eldredge wrote:
> You may want to double-check with the Post Office, to find out whether
> there is the possibility that there may legitimately be outliers in some
> cases. I don't think the US Post Office guarantees that zip codes will
> always define a single polygon with no outliers.
> they absolutely do not guarantee anything of the sort. zip codes represent
> delivery routes, not polygons. they can frequently be represented as
> polygons,
> but there are definitely legitimate outliers.
> richard
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