of 467 (the lowest was in 1901) and 818 (the highest was in 1871). From 1901, a census was taken every ten years with the exception of 1941 (due to the Second World War). All population census figures from report Historic Census figures Cambridgeshire to 2011 by Cambridgeshire Insight. The separate parishes of Houghton and Wyton were combined into a single parish in 1935. Part of this parish's area was separated as a new parish of Wyton on the Hill in 2010. In 2011, the parish covered an area of and so the population density of Houghton and Wyton in 2011 was 716.5 persons per square mile (276.6 per square kilometre). Notable buildings Houghton Mill is an old watermill owned by the National Trust that is used for demonstrating flour milling. It had previously been operated as a youth hostel. Houghton's Church of England parish church dates from the Norman era and is dedicated to St Mary. It now serves as the church for the combined parish of Houghton and Wyton. Near the church sits a former United Reformed Church that has been converted into a residential retreat centre. Other places of interest At the centre of the village is an area known as the village green, although it is completely paved. The centrepiece of the green is a thatched clock tower. Adjacent to the tower is a monumental bust of former village resident Potto Brown (1797–1871), a miller and nonconformist philanthropist. Also on the green are an old water pump and a traditional red telephone box. It is possible to walk from Houghton to Hemingford Abbots across the flood meadows, and to St Ives along the Thicket Path. There is a nature reserve (Wildlife Trust) along the Thicket Path known as Houghton Meadows ("Far Close") that shows markings of traditional ridge and furrow farming. In the village centre there is a war memorial hall. On Houghton Hill there is a cemetery. There used to be two veterinary poultry research centres, one on Houghton Hill and the other in "The Elms". There are a number of old houses of interest, particularly in the village green and near the playing field. The playing field is used for football, tennis and cricket. On the field there is a bowling club, cricket pavilion, tennis courts, football pitch and a scout hut. At the village green is the former home of artist Charles Whymper