Truru) is a city and civil parish in Cornwall, England. It is Cornwall's county town and only city and centre for administration, leisure and retail. Truro's population was recorded as 18,766 in the 2011 census. People from Truro are known as Truronians. As the southernmost city in mainland Britain, Truro grew as a centre of trade from its port and then as a stannary town for the tin mining industry. Its cathedral was completed in 1910.