* Please cite the original data sets, as well this site if using data I have cleaned.
The FBI collects criminal report data from state, local, and campus law enforcement agencies on a monthly basis, producing an annual file titled the National Incident Based Reporting System (NIBRS). This file is maintained and distributed by the National Archive of Criminal Justice Data and the Inter-university Consortium for Political and Social Research (ICPSR). Here I have linked to NIBRS files for incidents reported in 2013, files numbered 36121 on icpsr.umich.edu. Unfortunately, because law enforcement agencies report their data on a voluntary basis and the system is relatively new, NIBRS data are far from complete and likely suffer from selection bias (Addington 2008). 6,070 of about 12,500 local law enforcement agencies provided NIBRS data in 2013.
Law enforcement agencies are also surveyed about their agencies' personnel and policies. In 2007 and 2013 (as well as previous years), the U.S. Department of Justice’s Bureau of Justice Statistics conducted the Law Enforcement Management and Administrative Statistics (LEMAS) survey. They surveyed a representative sample of U.S. law enforcement agencies, receiving completed questionnaires from 2,059 agencies, for a response rate of 88.8 percent (Reaves 2015). These data include detailed information on agencies’ personnel, hiring criteria, budget, use of technology, and training practices.
The Census conducts a survey titled the American Community Survey (ACS), which includes zip codes’ racial demographics, mean income, unemployment rates, and percentages of black and white residents earning below $10,000, $20,000, and $40,000.
CQPress.com provides data on how US counties' voted in many elections, including the 2012 presidential election (McCain v. Obama).
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