DSDR KB:
Q:
I am having trouble measuring density for zip codes. I have pulled off land area and population size from the national SF1 file, but the results I'm getting are way too small.
A:
Density is calculated as Population/Area. The area item on the SF1 file is measured in square meters. To convert this to square miles divide "area" by 2,589,988.
To check your calculations, here is a reference to zip code densities in either square kilometers or square miles:
http://43topics.com/cityranks/#.
For instance the density of zip code 60302 is 10,856.69 per square mile and 4,191.79 per square kilometer.
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