No weapons were used in the 5 p.m. robbery Monday at the Mobil station on the northbound highway, they said.
The robbers reportedly fled in a black Nissan after apparently following the victim there.
Mahwah police administrators haven't responded to requests for information about the incident.
Mayor James Wysocki confirmed the robbery, however.
No other details were immediately available, including why the victim was driving around with that much cash, he said.
Detectives are investigating, said the mayor, who's a retired township police officer.
Wysocki said that anyone who might have witnessed the incident or has video or other information that could help identify the getaway vehicle and/or the robbers call Mahwah police: (201) 529-1000.
You can remain anonymous.
Click here to follow Daily Voice Mahwah-Ramsey and receive free news updates.