At issue was a federal law Congress passed in 2006 which removed confidentiality protections for sex offenders 14 and older.
The 9th U.S. Circuit Court of Appeals ruled that law does not violate the constitutional rights of the young offenders.
The ruling upheld registration requirements for three Montana youths who committed forcible sex crimes between ages 14 and 17 on American Indian reservations.
The Associated Press contributed to this report.