Violence Risk Factors Map 

A map of neighborhood risk factors for youth and gang violence in San José. A prototype.
A first draft produced by the San Jose Department of Parks, Recreation and Neighborhood Services, with help from the San José Police Department, Santa Clara County Public Health Department, and the City of San José. Built to help assess risk factors for youth and gang violence in our neighborhoods, based on the risk factors for Youth and gang violence from the US Department of Justice.

What are risk factors for youth & gang violence?

The US Department of Justice offers a set of risk factors for youth and gang violence, including prevalence of violent crime, poverty, and gang crime within a community. 


Gang-Affiliated Crime in Community

All crimes deemed  either "gang motivated" or "gang related."


Reports of graffiti by the San José Clean app. Download the app and other service request app: My San José.

Child Maltreatment

Crime reports of child neglect or abuse, and runaway youth.

Developmental Trauma Exposure

Crime reports of domestic violence, child molestation and unlawful intercourse with a minor.

Exposure to Violence and Racial Prejudice

Crime reports of robberies, assaults, criminal threats, and hate crimes.

Community Disorganization

All crime reports in a community, and percent of community below the poverty line.

Presence of Illegal Firearms

Crime reports of possessing an illegal firearm, and armed robbery.

School Violence and Low Graduation

Reports of school violence in San José by the Safe School Campus Initiative,  combined with high school graduation rates.


Percentage of youth and families living below the poverty line. See poverty statistics in San José here.

Substance Abuse

Crimes related to narcotics and minors in possession of drugs. Also includes presence of legal substance retailers in the community.

Youth with Disabilities

Percentage of youth with physical, mental, or emotional disabilities. While not a cause of violence, it is a major indicator.

Where does the data come from?

Our data comes from seven sources, including the Census, SJPD, and Santa Clara County. Our data looks at neighborhoods.

US Census - American Community Survey

Provides information on education level, social and economic status, and other demographic data. Race or ethnicity is not included in calculating risk.

San José Police Department Crime Reports 

Includes reports of crimes such as aggravated assault, child abuse, robbery, and many other crime types. Also includes any crimes potentially related to gang activity.

Santa Clara County Public Health Department - Public Health Data

Alcohol and Tobacco retailers per square mile, and teen pregnancy rates. Also provides names for all neighborhoods in the map.

Medical and Recreational Marijuana Retail Licenses

Provides the number of marijuana retailers per square mile in each neighborhood. Combined with Public Health Data, this outlines the market for legal substances.

Safe School Campus Initiative Incident Data

Safe School Campus Initiative collects data on violent incidents at all public schools in San José. This provides a sample of the violence students experience at school.

California Department of Education

Provides enrollment and graduation rates for all schools in San José. Also provides school attendance boundaries to see which neighborhoods attend each school.

SJ Clean Graffiti Abatement Requests

Graffiti often marks the presence of gang activity. SJ Clean holds over 70,000 reports of graffiti in San José over the last two years.

What are we using this data for?

This work helps identify areas of high risk for youth and gang violence to better target our programs which provide physical, mental, and emotional support. This data is one part of the information we use, which also includes interviews with community members, and discussions with community leaders. Learn more about our programs here.

Data always has limits. What are the limits of this data?

Reported data only

Some crime is not reported to the police, and we have no data on that crime. Some communities may have a lower level of reported crime compared to its actual crime rate.

Human error

Data reported by people may have a risk of data entry errors. While this was reduced through cleaning the data, there may be some minor issues.

Violence Risk Factors Map

An interactive map of San José's risk factors for youth and gang violence. See how this works under the hood here, and learn how this can help your organization assess needs. 

All metrics are treated equally in this map. To view specific metrics only, you can customize the map here.

Click on a neighborhood to learn more about it. Drag the map to move around, and zoom in by scrolling. Click on the buttons on the right to overlay different features. For an explanation of all overlays and features, click here .
An interactive map assessing San José's risk factors for gang and youth violence. See how this map works under the hood here.

Click on a neighborhood to learn more about it. Drag the map to move around, and zoom in by scrolling. All metrics are treated equally in this map. For more features, and to edit the metrics, view the map on a larger screen.
Hot Spots come from the 2015 and 2017 Hot Spot exercise from the Mayor's Gang Prevention Task Force (MGPTF)  

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