Boroughs
Urban District Councils could petition for a charter of incorporation, designating the urban district a Borough. The first of these was Bangor in 1927, followed by Coleraine in 1928, Ballymena and Newtownards in 1937, Larne in 1938, Portadown in 1947, Carrickfergus, Enniskillen and Lurgan in 1949, with Lisburn being the last in 1964.
Outside of this system were the Belfast and Londonderry county boroughs.
Read more about this topic: List Of Rural And Urban Districts In Northern Ireland