Alexa Foth, of Brentwood, was last seen on Monday, Sept. 30, according to the National Center for Missing & Exploited Children.
She may be traveling with a male companion, relatives said.
No other details were given.
Anyone with information is asked to contact the New York State Missing Persons Clearinghouse at 1-800-346-3543.
Share this story by clicking the Facebook icon below.
Check back to Daily Voice for updates.
Click here to follow Daily Voice Rockville Centre and receive free news updates.