A map of the Chicago mayoral election results of February 25, 2015, by precinct. Election results data scraped from the Chicago Board of Elections. Colors by ColorBrewer. Precinct shapefiles from a FOIA request to the Chicago Board of Elections, processed into TopoJSON by ogr2ogr, PostGIS, and topojson. Ward boundaries aggregated from precincts using PostGIS. City boundary data from City of Chicago data portal.
Chicago 2015 mayoral election results by precinct