Langley is a village in the unitary authority of Slough, in the south of England, west of London, in England's "Silicon Valley". It is famous for its Mars Bar factory.
Centuries ago, it was known as "Langley Marish", and St. Mary's Church houses the Kederminster Library.
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According to the United States Census Bureau, the town has a total area of 16.3 km² (6.3 mi²). 15.3 km² (5.9 mi²) of it is land and ...