 In 1974 Huntingdon and Peterborough was combined with the administrative county of Cambridgeshire and Isle of Ely, to form a new expanded non-metropolitan county of Cambridgeshire.The first part of this article covers the constituencies wholly or predominantly within the area of the historic county of Huntingdonshire, both before and after the administrative changes of 1889, 1965 and 1974.The second part refers to constituencies mostly in another historic county, which included some territory from the historic county of Huntingdonshire.