0820 GMT May 21, 2018
The victim will not be publicly identified at the family's request, the New York City medical examiner’s office said Monday.
More than 2,750 people were killed when two passenger jets destroyed the Twin Towers, the symbol of New York's financial wealth and confidence.
The remains - usually bone fragments - of 1,641 of the 2,753 people known to have been killed have now been positively identified.
The latest identification was the first in more than two years, the New York Times reported.
"This ongoing work is vital because with each new identification, we are able to bring answers to families affected by tremendous loss," chief medical examiner, Barbara Sampson, told The Times.
Advances in DNA extraction and testing technology helped confirm the victim's identity, the medical examiner's office said.