From National Journal (via Google Cache):
A new interactive map created by Vera Institute of Justice details the rapid growth in the jail population in every county. And it took 14 million Excel spreadsheets to make it happen.
The free online tool culls information from publicly available sources like the Bureau of Justice Statistics and the Census Bureau on the 3,000 county jails nationally. There are five filters through which the data can be explored. The first one offers the growth percentage change for each jail for which data is available. The second reveals the ratio of people in jail to the county’s population (x per 100K). The third breaks down the rate for Blacks/African Americans in each county, followed by another filter that does the same for women.The last filter records the combined jail and prison data for New York and California.
Direct to Interactive Data Resource (Map)
Report: “In Our Own Backyard: Confronting Growth and Disparities in American Jails”
Full Text, data files, methodology.