The historic county of Buckinghamshire, in the 21st century region of South East England, was represented in Parliament from the 13th century. This article provides a list of constituencies constituting the Parliamentary representation from Buckinghamshire. In 1889 Buckinghamshire became an administrative county. In 1974 a new non-metropolitan county of Buckinghamshire lost the Eton and Slough areas to Berkshire, while the part of Colnbrook formerly included in the county also became part of Berkshire in 1995. Note: Dates of representation before 1510 are provisional.