| Date | Legislation | Effect |
| 20 October 1844 | Counties Act 1844 |
- Caversfield†, Stratton Audley and Studley transferred to Oxfordshire
- Luffield Abbey transferred to Northamptonshire
- Ackhampstead†, Lillingstone Lovell and Boycott‡ transferred from Oxfordshire
- Coleshill§ from Hertfordshire
|
| 25 March 1883 | Local Government Board Order 19622 | Parts of Drayton Beauchamp and Marsworth transferred to Tring, Hertfordshire |
| 24 March 1884 | Local Government Board Orders 15986, 15987 | Part of Biddlesden transferred to Syresham, Northamptonshire |
| 25 March 1885 | Local Government Board Order 16585 | The Hudnall area of the parish of Edlesborough transferred to the parish of Little Gaddesden, Hertfordshire |
| 25 March 1888 | Local Government Board Order 21701 | Part of Marsworth transferred to Puttenham, Hertfordshire. |
| 30 September 1895 | Local Government Board Provisional Order 1170 | The parish of Nettleden transferred to Little Gaddesden, Hertfordshire. |
| 25 March 1896 | Local Government Board Provisional Order Confirmation Act | The parish of Stokenchurch transferred from Oxfordshire to Buckinghamshire Cadmore End and Studdridge transferred from OxfordshireIbstone transferred from Oxfordshire |
| 1 October 1900 | Local Government Board Order 41337 | Parts of the Buckinghamshire parish of Ashley Green exchanged with parts of parishes of Bovingdon and Northchurch, Hertfordshire. |
| 1 April 1907 | The Counties of Buckingham and Hertford Order 1906 | Part of Bovingdon, Hertfordshire transferred to Latimer, Buckinghamshire Parts of the parish of Chalfont St Peter transferred to Chorleywood, part exchanged with area in parish of Rickmansworth Rural, both in Hertfordshire Part of Chenies transferred to Chorleywood, HertfordshireDenham exchanged areas with Rickmansworth rural, Hertfordshire Parts of Hawridge transferred to Northchurch, Wigginton, Hertfordshire Latimer exchanged areas with Flaunden, Hertfordshire Part of Little Gaddesden transferred from Hertfordshire to EdlesboroughPart of Rickmansworth Rural, Hertfordshire transferred to Gerrards Cross |
| 1 April 1933 | Ministry of Health Provisional Order Confirmation Act 1933 | Towersey transferred to OxfordshireKingsey transferred from Oxfordshire |
| 5 June 1956 | Ministry of Health and Local Government Declaration | Exchanged areas with Oxfordshire along changed watercourse |
| 26 October 1956 | Ministry of Health and Local Government Declaration | Exchanged areas with Oxfordshire along changed watercourse |
| 21 December 1956 | Ministry of Health and Local Government Declaration | Exchanged areas with Bedfordshire along changed watercourse |
| 1 April 1965 | The Counties of Bedford and Buckingham Order 1965 | Linslade transferred to Bedfordshire |
| 1 April 1974 | Local Government Act 1972 | Slough and environs transferred to Berkshire See [|list of places] transferred below. |
| 1 April 1991 | The Buckinghamshire, Hertfordshire, Northamptonshire and Oxfordshire Order 1991 | Exchanged outlying areas of Chenies and Ashley Green with HertfordshireExchanged unpopulated areas with NorthamptonshireExchanged unpopulated areas with Oxfordshire |
| 1 April 1991 | The Bedfordshire, Buckinghamshire and Cambridgeshire Order 1991 | Exchanged outlying areas of Astwood, North Crawley and Wavendon with Bedfordshire |
| 1 April 1995 | The Berkshire, Buckinghamshire and Surrey Order 1994 | Colnbrook transferred to Berkshire |
