Are you looking for a ZIP Code map? If so, these are generally not free. You can use a ZCTA file from the Census. This approximates the ZIP Code but is not exactly it. The ZIP Code maps change every month. The Post Office is constantly changing them. Even if you buy a ZIP Code map, it will be somewhat out of date because the map will only updated every year or two.
Here is the main level of information:
And the file is here (Look for ZIP Code Tabulation Areas):
Hi, for some help, take a look at ...
From Shapefiles to Maps Via PROC MAPIMPORT and PROC GMAP
Creating ZIP Code-Level Maps with SAS®
Wow! You Did That Map with SAS/GRAPH®?
(or send a note to me ... firstname.lastname@example.org ... if you run into a problem)
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