Crime Maps by Trulia
http://www.trulia.com/crime/#

Crime and safety are important factors when deciding on where to live. Trulia aims to aggregate the data and help home buyers and homeowners make better decisions. The crime data is provided by three partners, CrimeReports.com, EveryBlock.com and SpotCrime.com. These partners work with police agencies, crime feeds and news outlets for data. Unfortunately, not all police agencies publish data and we are limited by the partners we work with. The heat maps are created by analyzing the density of 12 months of crime data across census blocks. The color scale is relative, with an even percentage distribution across all cities. This means that the top 5% of blocks with the most crime density are colored dark red across every city, the next 5%-10% of blocks are light red while the next 10%-20% of blocks are orange, etc, following an s-curve distribution. The incident-level data (black dots) represents up to 2,500 of the most recently reported crime data. Updates to this crime data varies based on agency and location, from hourly to monthly, resulting in different cities having different time frames for data. This has been added to the tools section of Research Resources Subject Tracer™ Information Blog. This has been added to Business Intelligence Resources Subject Tracer™ Information Blog.