Samantha Primus, of Elmont, was last seen on Savoy Avenue in Elmont at about 3:30 a.m. on Friday, Dec. 23, authorities said.
Police said Primus has developmental disabilities and uses limited sign language.
She is 5-foot-3 and 130 pounds, with black hair and brown eyes, authorities said.
Police said she was last seen wearing a pink hooded sweatshirt, blue jeans, black sneakers, and a pink knit hat.
Authorities asked anyone with information about Primus' whereabouts to call the Nassau County Police Department at 516-573-7347 or 911.
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