It happened at 7:00 p.m. Thursday in the 700 block of Route 113.
Authorities say the man handed the teller a note demanding money.
The teller gave the suspect the money and he fled in a small silver vehicle.
No one was hurt and no weapon was shown during the robbery.
The bandit is described as a white male, in his 30's and about 6 feet tall.
Witnesses told police he appeared scruffy with a few days' growth of facial hair.
He was last seen wearing a teal green jacket and baseball cap.
Anyone with information was being asked to contact Hilltown Township Police.
