The data that I am using, from the US Census Bureau (American Community Survey, PUMS [Public Use Microdata Sample] file), is arguably the most comprehensive source of available information on the American population.  The only problem with it is that it has been overly challenging to convert the mountain of data into usable information.

21 years ago I worked with one of the major telephone companies, helping them turn nearly 100 million customer accounts and billions of telephone transactions into usable information.  (By comparison, the ACS data is small, because it is a sample of the US population.)  Now I’m doing the same thing that I did with the telephone company by myself, with US Census data.

— John Grumbine