2016 precincts of Iowa — ia

Precinct and district shapefiles are published by the Secretary of State. Election results of the 2016 general election are added to each precinct.

ia_precincts

Format

A data frame with 1690 rows and 16 variables:

COUNTY: county
DISTRICT: DISTRICT, precinct and NAME are used as names of a precinct.
precinct: DISTRICT, precinct and NAME are used as names of a precinct.
NAME: DISTRICT, precinct and NAME are used as names of a precinct.
POPULATION: population of the precinct.
Votes16: Total number of votes cast in the US general election for US President.
PctRep16: Percent of votes in the district cast for the candidate of the Republican Party
PctDem16: Percent of votes in the district cast for the candidate of the Democratic Party
PctLib16: Percent of votes in the district cast for the candidate of the Libertarian Party
PctOther16: Percent of votes in the district cast for a candidate of an other party.
House_Dist: House district affiliation
Senate_Dis: Senate district affiliation
Congressio: Congression district affiliation
AREA: Area of the district.
Shape_Leng: Numeric value derived from polygon.
geometry: sfc object of polygons describing each district.

Source

https://sos.iowa.gov/elections/maps/shapefiles.html

Examples

library(leaflet)
pal <- colorNumeric(palette=c("Darkred", "White", "Darkblue"),
                    reverse = TRUE,
                    domain = range(ia_precincts$PctRep16 - ia_precincts$PctDem16, na.rm=TRUE))

ia_precincts %>%
  leaflet() %>%
    addTiles() %>%
    addPolygons(fillColor = ~pal(PctRep16-PctDem16), fillOpacity = .75,
                stroke=0, opacity = 1, label=~NAME) %>%
    addLegend(pal=pal, values  = range(ia_precincts$PctRep16 - ia_precincts$PctDem16, na.rm=TRUE))