General demographic data for all U.S. cities, including crime statistics, is available at City-Data.com. Demographic information specifically related to criminal offenders, prisoners and crime victims is available through the FBI's annual uniform crime report.
City-Data.com offers a summary of demographic data for the population in each U.S. city, including median age, gender, household income, marital status and education level. The website also provides an overview of local crime statistics for violent crimes, property crimes and also reports the number of convicted sex offenders living in a community.
The FBI’s Uniform Crime Reporting program is the main source of crime statistics for all known criminal offenses committed in the United States each year. The UCR program collects data from local criminal justice agencies and releases an annual report and data tables summarizing national, state and local crime statistics.
The FBI data includes demographic information regarding the age, race and gender of crime victims and offenders, with additional details focused on homicides and rapes. The data also includes demographics of arrested persons as well as prison populations.
The U.S. Census Bureau reports national, state and local demographic data and provides special crime reports regarding topics such as stalking, harassment and hate crimes broken down by sex, race and location.