Dartmouth is a town and civil parish in the English county of Devon. It is a tourist destination set on the western bank of the estuary of the Riveā¦Dartmouth is a town and civil parish in the English county of Devon. It is a tourist destination set on the western bank of the estuary of the River Dart, which is a long narrow tidal ria that runs inland as far as Totnes. It lies within the South Devon Area of Outstanding Natural Beauty and South Hams district, and had a population of 5,512 in 2001, reducing to 5,064 at the 2011 census. There are two electoral wards in the Dartmouth area. Their combined population at the above census was 6,822.