A shire is a traditional term for a division of land, found in the United Kingdom and in Australia. In parts of Australia, a shire is an administrative unit, but it is not synonymous with "county" there, which is a land registration unit. Individually, or as a suffix in Scotland and in the far northeast of England, the word is pronounced /ˈʃaɪər/. As a suffix in an English or Welsh place name, it is in most regions pronounced /ʃɜr/, or sometimes /ʃɪər/.
In Britain, "shire" is the original term for what is usually known as a county; the word county having been introduced at the Norman Conquest of England. The two are synonymous. Although in modern British usage counties are referred to as "shires" mainly in poetic contexts, terms such as Shire Hall remain common. Shire also remains a common part of many county names.
The word derives from the Old English scir, itself a derivative of the Proto-Germanic skizo (cf. Old High German scira), meaning care or official charge. The system was first used in Wessex from the beginning of Anglo-Saxon settlement, and spread to most of the rest of England in the tenth century, along with West Saxon political control. In Domesday (1086) the city of York was divided into shires. The first shires of Scotland were created in English-settled areas such as Lothian and the Borders, (Bernicia) in the ninth century. King David I more consistently created shires and appointed sheriffs across lowland shores of Scotland.
The shire in early days was governed by an Ealdorman and in the later Anglo-Saxon period by royal official known as a "shire reeve" or sheriff. The shires were divided into hundreds or wapentakes, although other less common sub-divisions existed. An alternative name for a shire was a "sheriffdom" until sheriff court reforms separated the two concepts. In Scotland the word "county" was not adopted for the shires. Although "county" appears in some texts, "shire" was the normal name until counties for statutory purposes were created in the nineteenth century.
Read more about Shire: Shire County, Shire Names in The United Kingdom, Shires in Australia, Shires in The United States