06 / DATA LITERACY
How to Read Your City's Crime Statistics
Crime statistics can help residents ask better questions about safety, public services, and community needs. To interpret them fairly, it helps to understand what each number measures—and what it leaves out.
Start with the source and definition
Look for the agency that collected the data, the reporting period, the geographic boundary, and the definitions used. A city police department, a county sheriff, a campus police agency, and a third-party estimate may cover different places or populations. Do not assume they measure the same thing.
The FBI's Crime Data Explorer provides reported crime data and information about participating law-enforcement agencies. The Bureau of Justice Statistics also explains the difference between police-reported data and victimization surveys in its National Crime Victimization Survey overview.
Counts and rates answer different questions
A raw count tells you how many incidents were recorded. A rate—often expressed per 1,000 or 100,000 residents—helps compare places with different population sizes. Rates are not perfect: daytime visitors, commuting, tourism, and where an incident is recorded can affect how well resident population reflects the people present.
Make an apples-to-apples comparison
- Use the same years or months for each place.
- Compare the same crime categories and reporting systems.
- Use rates with a clearly stated denominator when population sizes differ.
- Check whether the data are preliminary, incomplete, estimated, or based on a small population.
- Look at several years and multiple categories before describing a trend.
- Keep citywide statistics separate from block-level or apartment-complex safety.
Remember what the data cannot tell you
Recorded crime can be affected by whether incidents are reported, how agencies classify them, and whether data are submitted. Victimization surveys can capture some incidents not reported to police, but surveys also have limitations. Neither source alone describes every aspect of safety or predicts what will happen to a particular person.
Use statistics as one piece of a careful decision—not as a guarantee. For a housing decision, combine reliable local information with practical factors such as lighting, building access, parking, and current neighborhood conditions.
Sources: FBI Crime Data Explorer and Bureau of Justice Statistics NCVS. Data coverage and definitions can change over time.