>From the page which Bryce referred to in 
>http://lists.openstreetmap.org/pipermail/talk-us/2013-September/011738.html 
>comes the following passage:

"The term ZCTA was created to differentiate between this entity and true USPS 
ZIP Codes.
ZCTA is a trademark of the U.S. Census Bureau; ZIP Code is a trademark of the 
U.S. Postal Service."

Therefore, ZCTA information _approximates_ ZIP information for census purposes. 
 If you want to map/use ZIP code information, don't use the ZCTA information to 
do it, I would infer.--ceyockey

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