Buckinghamshire (/ˈbʌkɪŋəmʃər, -ʃɪər/, abbreviated Bucks) is a ceremonial county in South East England. It is bordered by Northamptonshire to the north, Bedfordshire to the north-east, Hertfordshire to the east, Greater London to the south-east, Berkshire to the south, and Oxfordshire to the west. The largest settlement is the city of Milton Keynes.
The county has an area of 1,874 km (724 sq mi) and had an estimated population of 884,656 in 2024. Besides Milton Keynes, which is in the north-east, the largest settlements are in the centre and south of the county and include Aylesbury, High Wycombe, and Chesham. For local government purposes the county comprises two unitary authority areas, Buckinghamshire and Milton Keynes. The county historically had slightly different borders, and included the towns of Slough and Eton. It is one of the home counties