Northern Ireland is the smallest UK nation by population (around 1.9 million), occupying the north-east of the island of Ireland with its capital at Belfast. It is known for the Giant's Causeway, the Mourne Mountains, the Causeway Coast and Lough Neagh, the largest freshwater lake in the British Isles.
Every Northern Irish postcode falls within the single BT postcode area, covering Belfast, Derry/Londonderry and communities across all six counties. Browse any BT postcode for local information on transport, schools, services and the surrounding area.