A good tip comes our way from the Librarians' Internet Index, which is something of a venerable digital resource these days.  Social Explorer has put a good front end on census data and generates dynamic maps.  There is a fair amount of free material, but a subscription fee is necessary to slice and dice data to meet your specific needs.  Still, the price isn't too high for what you get if you're in an organization kicking out a lot of maps.  (Wow, where was this tool when, 40+ years ago, we were trying to figure out the best location for Volkswagen dealerships?)

Social Explorer








This site “provides easy access to demographic information about the United States, from 1940 to 2000,” by featuring “thousands of maps and hundreds of reports with thousands of variables.” Includes interactive census maps (showing population, age, race, occupation, and other factors) and related reports. Additional features are available for a fee.

URL: http://socialexplorer.com/

LII Item: http://lii.org/cs/lii/view/item/25076