There's more than one place called Monmouth: United Kingdom Monmouth (Wales) - the county town of Monmouthshire, South Wales Monmouthshire - the historic county United States of America Monmouth (Illinois) - a town in Warren County, Illinois Monmouth (Maine) - a town in Kennebec County, Kennebec and Moose River Valleys, Maine Monmouth (Oregon) - a city in Polk County, Oregon Monmouth County - in the Jersey Shore region of New Jersey