The armed guerrillas apparently entered the town and opened fire on the police station in an attack that, along with the listed casualties, left an unspecified number injured.
The badly wounded policeman has been transferred to Quibdo, capital of the Choco department, due to the gravity of his injuries.
Armed forces and police are currently pursuing the guerrillas, who escaped to the jungle region.
On Tuesday, a separate alleged FARC attack in the Cauca department, southwest Colombia, left three policemen dead and three civilians wounded. This latest attack brings the total number of “FARC” police casualties to five over the last two days.