Get all congressional districts for a given ZIP code
get_cd(zip_code)
A U.S. ZIP code
a named list of two-digit state code and two digit district code
get_cd("08731")
#> $state_fips
#> [1] "NJ"
#>
#> $district
#> [1] "03"
#>
get_cd("90210")
#> $state_fips
#> [1] "CA"
#>
#> $district
#> [1] "28" "30" "33"
#>