The coroner's office identified the body as Desiree Moriel of Diamond Bar.
Anaheim police found Moriel's body near the Katella Avenue off-ramp on the northbound side of the freeway following numerous phone calls.
Officers say some callers indicated the person may have jumped or been tossed from a moving vehicle.
The cause of death is unknown at this time.
Anyone with information about this case was urged to call Orange County Crime Stoppers at (855) TIP-OCCS.