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High Wycombe, often referred to as Wycombe ( WIK-əm), is a market town in Buckinghamshire, England. Lying in the valley of the River Wye surrounded by the Chiltern Hills, it is 29 miles (47 km) west-northwest of Charing Cross in London, 13 miles (21 km) south-southeast of Aylesbury, 23 miles (37 km) southeast of Oxford, 15 miles (24 km) northeast of Reading and 8 miles (13 km) north of Maidenhead.
According to the 2021 United Kingdom census, High Wycombe's built up area has a population of 127,856, making it the largest town in the ceremonial county of Buckinghamshire. The High Wycombe Urban Area, the conurbation of which the town is the largest component, has a population of 140,684. Part of the urban area constitutes the civil parish of Chepping Wycombe, which had a population of 14,455 according to the 2001 census – this parish represents that part of the ancient parish of Chepping Wycombe which was outside the former municipal borough of Wycombe. There has been a market held in the High Street since at least the Middle Ages. The market is currently held on Tuesday, Friday and Saturday.