Since 1996, the National Youth Gang Center has conducted an annual survey of law enforcement agencies to identify the presence and assess the extent of the youth gang problem in jurisdictions throughout the United States. The National Youth Gang Survey is based on a nationally representative sample of law enforcement agencies serving larger cities, suburban counties, smaller cities, and rural counties. This Summary presents findings from the 1999, 2000, and 2001 surveys and, where available, preliminary findings from the 2002 survey.