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choroplethrZip (version 1.5.0)
df_pop_zip: A data.frame containing population estimates for US Zip Code Tabulated Areas (ZCTAs) in 2012.
ZCTAs are intended to be roughly analogous to postal ZIP codes.
Taken from the US American Community Survey (ACS) 5 year estimates. ZCTAs, and their realationship to ZIP codes, are explained here