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Using the TIGER file from here: http://www2.census.gov/geo/tiger/TIGER2014/COUNTY/tl_2014_us_county.zip you can do this: # use rgdal to read read in the shapefile to preserve projection information library(rgdal) soco <- readOGR(".", "tl_2014_us_county") # use soco$STATEFP to find states, SpatialPolygonsDataFrame behaves like a data frame ne <- ...

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