This site contains archived materials but these organizations can offer current youth violence prevention statistics and resources, both in California and beyond:

Youth & Community Violence Prevention
Center on Juvenile and Criminal Justice
Coleman Advocates for Youth And Children
Communities United Against Violence
HOMEBOY Industries
In the Mix
L.A. Youth
Santa Cruz Barrios Unidos
Student Pledge Against Gun Violence
Youth Alive!
Youth Uprising
Youth Justice Institute

Gun Violence Prevention
Brady Center To Prevent Gun Violence
Coalition to Stop Gun Violence
Law Center to Prevent Gun Violence (was LCAV)
Mayors Against Illegal Guns
National Crime Prevention Council
States United to Prevent Gun Violence
Women Against Gun Violence

Research, Data and Policy
Children Now
Commonweal Juvenile Justice Program
Fight Crime: Invest in Kids
The W. Haywood Burns Institute
Justice Research and Statistics Association
Kidsdata.org
Little Hoover Commission
National Council on Crime & Delinquency (NCCD)
National Criminal Justice Reference Services
National Gang Crime Research Center
Prevention Institute
Prevention Research Center
RAND
Violence Policy Center
Youth Law Center