1,015 at the time of the 2011 census.

Bourn has a Church of England primary school, a doctors' surgery, the Church of St Mary & St Helena, a golf club, a former Royal Air Force bomber airfield (RAF Station Bourn 1940-1945), today used for light aircraft, and an old windmill. Bourn Hall Clinic, the centre for infertility treatment founded in 1980 by IVF pioneers Patrick Steptoe