Bythorn and Keyston is a civil parish in the Huntingdonshire district of Cambridgeshire, England.

In the period 1801 to 1901 the populations of the two separate parishes of Bythorn and of Keyston were recorded every ten years by the UK census.

[3] From 1901, a census was taken every ten years with the exception of 1941 (due to the Second World War).

[3] In 2011, the parish covered an area of 4,250 acres (1,720 hectares)[3] and so the population density for Bythorn and Keyston in 2011 was 47.6 persons per square mile (18.4 per square kilometre).

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