Truro is a cathedral city and civil parish in Cornwall, England. It is the southernmost city in the United Kingdom, and lies 232 miles (373 km) west-south-west of London. It is Cornwall's county town, only city, and a centre for administration, leisure and shopping. At the 2021 census the population of the parish was 21,046 and the population of the built up area as defined by the Office for National Statistics was 23,060.