I'm very new to creating maps using shapefiles, so this question might be
pretty basic.

I'm trying to create a map of the US, divided up by zip codes, where i then
map number of customers by zip code.
I located shapefiles for US with zip codes (although at this point only for
individual states, and not the entire country) and read it into R using
maptools,
but now I need to apply my data (which I read into R as a separate data
frame and not a shapefile) to that map. Which is the part where I get
completely lost and not sure how to proceed. If anyone could give me any
pointers I'd really appreciate it.

thank you

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