Denison Police, Fire, EMS, Crawford County Sheriff, and Iowa State Patrol, are dispatched by County-Wide E-911 Communications Center, which is operated by the Denison Police ... See more Department, Denison, Iowa, United. The Center is the only public service answering point in Crawford County and is responsible for dispatching the Denison, Dow City, Manilla, and Charter Oak police departments, the Crawford County Sheriffs Office, eight fire departments and their respective EMS first responder personnel, and the Crawford County Memorial Hospital EMT/Paramedic Ambulance Service.