Where can I find statistics on the number of juveniles arrested in the United States?

Juvenile arrest statistics are available in the Federal Bureau of Investigation (FBI) report, Crime in the United States and in the Office of Juvenile Justice and Delinquency Prevention (OJJDP)/National Institute of Justice bulletin, Juvenile Arrests 2018.

Also see the Law Enforcement and Juvenile Crime and the Juvenile Arrest Rates sections of the OJJDP Statistical Briefing Book (SBB).