block by mbostock 39b34968ad5eab65de1d7da81f78bb27

California Population Density II

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A variation of my California population density map using California’s 23,198 block groups rather than its 8,043 tracts. The example exhibits how useful the Census API is: the prepublish script here can automatically grabs the list of counties for the desired state and then the population data for each block group.