Michael Oliveri, 46, of Whittier, and 21-year-old Karlie Daily of La Habra were identified by the coroner as the victims of the crash.
It happened just before 8 a.m. Saturday morning at the intersection of Rosecrans Avenue and Beach Boulevard.
The car was speeding when it lost control, hit a fire hydrant and knocked down a utility pole, investigators say.
MORE | Father, daughter killed when car shears fire hydrant, slams into pole in La Mirada
Father, daughter killed when car shears fire hydrant, slams into pole in La Mirada
The car then slammed into a sign pole at a shopping center.
Both victims were ejected and pronounced dead at the scene.