#' 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.
#'
#' @name df_pop_zip
#' @docType data
#' @references Taken from the US American Community Survey (ACS) 5 year estimates.
#' ZCTAs, and their realationship to ZIP codes, are explained here \url{https://www.census.gov/geo/reference/zctas.html}.
#' @keywords data
#' @usage data(df_pop_zip)
#' @examples
#' data(df_pop_zip)
#' zip_map(df_pop_zip, title="2012 Population Estimates")
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