The most populous city in each US state, as of the 2010 US Census.
The data is formatted for transforming with usmap_transform.
Once the longitude and latitude is transformed, it can be added to
plot_usmap using ggplot2 layers.
data(citypop)A data frame with 51 rows and 5 variables.
lon The longitude of the most populous city.
lat The latitude of the most populous city.
state The name of the state containing the city.
most_populous_city The name of the city.
city_pop The population of the city.