Pulling information from the Census Bureauhttp://www.census.gov/popest/counties/ and the USGSSpecifically the Board on Geographic names: http://geonames.usgs.gov/domestic/index.html, I’ve create two quick SVG maps as a follow on to yesterday’s map of school density in the US. The top map is the density of cities by county, while the lower map details the US Census estimated 2008 population of each county. I’ve maintained similar color schemes for each to remove any ambiguity, and while the scaling of the city density map uses the same numeric thresholds as the school density map, the population density map breaks the county population down into 6 brackets:

• 500,000 < pop
• 100,000 < pop < 500,000
• 50,000 < pop < 100,000
• 10,000 < pop < 50,000
• 1,000 < pop < 10,000
• pop < 1,000