This demo uses an open source data from http://www.hri.fi/en/ which is a service providing Open data from Finland the Helsinki Metropolitan Area for people to use freely.
I’m using the geojson dataset containing Helsinki Region Transport tariff zones. http://data.hslhrt.opendata.arcgis.com/datasets/454915a7b25e4a7eac99383c908dc56f_0.geojson
This demo was created 9th January 2018
library("leaflet")
library("geojsonio")
url <- 'http://data.hslhrt.opendata.arcgis.com/datasets/454915a7b25e4a7eac99383c908dc56f_0.geojson'
tariffData <- geojsonio::geojson_read(url, what = "sp")
cols <- colorFactor(topo.colors(nrow(tariffData)),tariffData$NIMI)
leaflet() %>% addProviderTiles(providers$Stamen.Terrain) %>%
addPolygons(data=tariffData, opacity = 5,
label=~NIMI, weight = 1, fillColor = ~cols(NIMI))