It happened around 4:30 p.m. on Bryan Drive, just off Main Street.
Officials say the animal bit the 61-year-old victim's leg before running behind her home.
She was treated at the scene and taken to the hospital for further evaluation.
Animal Control responded and canvassed the surrounding area with dogs but were unable to locate the fox.
The neighborhood borders wooded areas where wildlife thrives, so seeing a fox is not unusual, but one that would attack a human is a cause for great concern.
Officials are urging residents in the affected area to avoid contact with stray or wild animals and to remain vigilant for unusual behavior.
They also advise pet owners to keep up with rabies vaccinations and to supervise children and pets outdoors.
There have been at least five animal attacks since September in North Jersey, including a bear attack in Vernon, two coyote attacks in Saddle River, a fox attack in Fair Lawn involving a teenager and a coyote attack in Woodcliff Lake.
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