1885-1918: The Municipal Borough of Buckingham, the Sessional Divisions of Ashendon, Buckingham, Newport, and Stony Stratford, and part of the Sessional Division of Winslow.
1918-1950: The Municipal Borough of Buckingham, the Urban Districts of Bletchley, Linslade, and Newport Pagnell, the Rural Districts of Buckingham, Newport Pagnell, Stratford and Wolverton, Wing, and Winslow, in the Rural District of Aylesbury the civil parishes of Ashenden, Chearsley, Grendon Underwood, Kingswood, Ludgershall, Woodham, and Wotton Underwood, and the part of the Rural District of Long Crendon which was not included in the Aylesbury constituency.
1950-1974: The Municipal Borough of Buckingham, the Urban Districts of Bletchley, Linslade, Newport Pagnell, and Wolverton, and the Rural Districts of Buckingham, Newport Pagnell, Wing, and Winslow.
1974-1983: The Municipal Borough of Buckingham, the Urban Districts of Bletchley, Newport Pagnell, and Wolverton, and the Rural Districts of Buckingham, Newport Pagnell, Wing, and Winslow.
1983-1992: The District of Aylesbury Vale wards of Bierton, Brill, Buckingham North, Buckingham South, Cheddington, Eddlesborough, Great Brickhill, Great Horwood, Grendon Underwood, Haddenham, Hogshaw, Long Crendon, Luffield Abbey, Marsh Gibbon, Newton Longville, Oakley, Pitstone, Quainton, Steeple Claydon, Stewkley, Stone, Tingewick, Waddesdon, Wing, Wingrave, and Winslow, and the Borough of Milton Keynes wards of Stony Stratford, Wolverton, and Wolverton Stacey Bushes.
1992-1997: The District of Aylesbury Vale wards of Bierton, Brill, Buckingham North, Buckingham South, Cheddington, Eddlesborough, Great Brickhill, Great Horwood, Grendon Underwood, Haddenham, Hogshaw, Long Crendon, Luffield Abbey, Marsh Gibbon, Newton Longville, Oakley, Pitstone, Quainton, Steeple Claydon, Stewkley, Stone, Tingewick, Waddesdon, Wing, Wingrave, and Winslow.
1997-2010: The District of Aylesbury Vale wards of Aston Clinton, Bierton, Brill, Buckingham North, Buckingham South, Cheddington, Eddlesborough, Great Brickhill, Great Horwood, Grendon Underwood, Haddenham, Hogshaw, Long Crendon, Luffield Abbey, Marsh Gibbon, Newton Longville, Oakley, Pitstone, Quainton, Steeple Claydon, Stewkley, Stone, Tingewick, Waddesdon, Wing, Wingrave, and Winslow.
2010–present: The District of Aylesbury Vale wards of Bierton, Brill, Buckingham North, Buckingham South, Cheddington, Edlesborough, Great Brickhill, Great Horwood, Grendon Underwood, Haddenham, Long Crendon, Luffield Abbey, Marsh Gibbon, Newton Longville, Pitstone, Quainton, Steeple Claydon, Stewkley, Tingewick, Waddesdon, Weedon, Wing, Wingrave, and Winslow, and the District of Wycombe wards of Icknield and The Risboroughs.
The seat has sent MPs since 1542 — its standard double representation was halved in 1868. In the twentieth century, the constituency was held by the Conservative Party for most of the time. However, a Labour Party MP served Buckingham from 1945 until 1951, Aidan Crawley and from 1964 until 1970 its Labour MP was the controversial publisher Robert Maxwell.
Before 1983, the new town of Milton Keynes, including its older parts such as Bletchley and Fenny Stratford[n 3] was in the Buckingham constituency, until its population had expanded substantially enough to merit a seat of its own. The sitting Buckingham MP William Benyon moved to the new Milton Keynes constituency. Benyon's successor in Buckingham was Conservative George Walden. Walden retired in 1997, and John Bercow has held the seat since then. In 2009, Bercow was elected as Speaker of the House of Commons following the resignation of Michael Martin and there is an inconsistently followed convention not to oppose a professed speaker candidate at election which is mostly kept by the major parties — nonetheless UKIP's leader stood against Bercow in the 2010 election but finished third behind the Buckinghamshire Campaign for Democracy founder who previously founded the Pro-Euro Conservative Party.[3]