In 2001, the town of Benthuizen had 3215 inhabitants. The built-up area of the town was 0.51 km², and contained 1110 residences. The statistical area "Benthuizen", which also can include the peripheral parts of the village, as well as the surrounding countryside, has a population of around 3450.
Benthuizen has a long history that goes back to the beginning of the 12th century, it was then that the village was described for the first time. Until 1991 Benthuizen was an independent municipality in that year the municipality became part of the larger municipality Rijneveld. In 1993 the name was changed to Rijnwoude.
The HSL-Zuid being constructed passes Benthuizen on the eastern side. Also the new Bentwoud (forest) is planted to the east of Benthuizen.
Benthuizen has several buildings that are officially designated monuments. One of these is the historic windmill known as molen de Haas.