At Domesday 108 people were recorded on the manor of Hayes. Of these one was a priest, 3 were knights, and 74 were villeins; there were also 16 bordars, 12 cottars, and 2 serfs. These figures, however, presumably include the precinct of Norwood. In 1547 there were 270 communicants in the parish of Hayes. In 1642 in Hayes parish 178 adult males took the protestation oath. Hearth tax was assessed on 76 houses in 1664 and a further 45 were exempt. The same number, 121 houses, occurs later in the century. In 1801 the population was 1,026. This figure had increased to 2,076 by 1851. A large increase in 1861 is accounted for by the opening of the St. Marylebone parochial schools and by the erection of large numbers of cottages for brick-workers. A slow increase until 1881 was followed by a slight decline, so that in 1901 there were only 2,594 people in the parish. The population had nearly doubled by 1911 and ten years later numbered over 6,303 people. Since that date the population has risen steeply to over 19,000 in 1931 and to 49,650 in 1951. The total population of Hayes and Harlington was 67,915 in 1961. This large increase, unlike that in many Middlesex parishes, can be related more to the opening of communications and the coming of large industry than to the expansion of a mainly dormitory population.