Police say none of the 21 women matched up to a missing persons case or an unsolved homicide.
Detectives were inundated with more than 500 phone calls and hundreds of e-mails after the photos were posted on the Orange County Register's Web site. Huntington Beach police released the photos to the newspaper last month after Alcala was sentenced to death for the murders of four women and a 12-year-old girl.
The photos were found in Alcala's Seattle storage locker in 1979.