A spokeswoman for the New York City medical examiner's office says the woman's name won't be released at her family's request.
Some 2,750 people died at the World Trade Center in the Sept. 11, 2001, terrorist attacks. Friday's announcement brings the number of identified victims up to 1,636.
The identification was made from remains collected before May 2002. The last time a person was identified from the original remains recovered at the site was in October.
Recently authorities have been sifting through truckloads of debris unearthed by construction crews working on the World Trade Center rebuilding. Possible remains of more than 20 victims have been recovered since that process began in April.