is truro the only city in cornwall?
Truro (/ˈtrʊəroʊ/; Cornish: Truru) is a cathedral city and civil parish in Cornwall, England, UK. It is Cornwall's county town and only city, as well as being its centre for administration, leisure and retail. Its population was recorded as 18,766 in the 2011 census. People from Truro are known as Truronians.