Londonderry, locally and historically Derry and Irish Doire, city and former district (1973–2015), now in Derry City and Strabane district, northwestern Northern Ireland. It is Northern Ireland’s second most populous city. Long part of the former County Londonderry, the old city and adjacent urban and rural areas were administratively merged in 1969 and became one of Northern Ireland’s 26 districts during the United Kingdom’s local government reorganization in 1973, which was reordered in 2015. The name Derry comes from the Irish word doire, meaning “oak grove.” “London” was appended as a prefix to the name in 1613 when King James