[R] us zipcode data map

[Mike R]

i'm likely looking for something that does not exist:

http://www.census.gov/cgi-bin/geo/tigerfaq?Q16

==begin quote 
Note that the task of creating a lat/long or polygon file of all ZIP Codes is
not as easy as it seems since ZIP Codes are not designed to be polygons and
can't easily be forced into them - particularly in rural areas. To our knowledge
there are no official internal point or polygon files available.
However, because
of the demand for ZIP Code data and maps, the Census Bureau, for Census 2000,
created a new statistical area called the ZIP Code Tabulation Area (ZCTA).
ZCTAs are close area approximations of U.S. Postal Service ZIP Codes and
were designed to overcome the difficulties of defining clear boundaries to which
data could be attached. For more information on ZCTAs go to:

http://www.census.gov/geo/ZCTA/zcta.html 

==end quote