Paul Cobb Methuen served as a Member of Parliament for Great Bedwin. On 20 April 1776, he married Matilda, daughter of Sir Thomas Gooch, 3rd Baronet of Benacre, Suffolk. They had four sons and four daughters; the eldest son, also named Paul, became the 1st Baron Methuen.
Britton, John. An Historical Account of Corsham House in Wiltshire; the Seat of Paul Cobb Methuen, Esq., with a Catalogue of his celebrated Collection of Pictures, London, 1806.