Eileen Heffernan, 75, left her Kinderkamack Road home and was last seen at 4:30 a.m. Aug. 26, borough police said.
Police pinged her cellphone to Branchville, in Sussex County, and she was found a short time later.
Hefferman was taken to a nearby hospital for an evaluation, they said.
Click here to follow Daily Voice West Milford and receive free news updates.