Truro is a cathedral city and civil parish in Cornwall, England; it is the southernmost city in the United Kingdom, just under 232 miles west-south-west of Charing Cross in London. It is Cornwall's county town, sole city and a centre for administration, leisure and retail trading. Its population was 18,766 in the 2011 census. People of Truro can be called Truronians. It grew as a trade centre through its port and as a stannary town for tin mining.