The man is believed to be in his mid to late 40s, wearing a baseball cap and thick glasses.
He went into the bank around 11:40 a.m. and handed the teller a note saying, "This is a robbery."
He also said he had a gun, but nobody actually saw one. The teller gave him the money, and he took off on foot.
"We're doing interviews, we're canvassing the area for possible witnesses, we did take a bike into custody, and we're not sure if that's something used or not, but we did find one, and we're going to continue interviews, we're processing for evidence inside the bank, and we'll go from there with it," says Lt. Ned Seubert of the Merrill Police Department.
The Marathon and Lincoln County Sheriff's Departments, and the FBI are also on the case. Nobody was hurt during the robbery.
Seubert says that's because all the workers did what they're supposed to do in that kind of situation.
If you know anything about this case, call the Merrill Police Department at 536-8311, or the FBI at 842-2666.