- a county in NE Northern Ireland. 1098 sq. mi. (2844 sq. km). County seat: Belfast.
- an administrative district in this county. 217 sq. mi. (563 sq. km).
- a historical county of NE Northern Ireland, famous for the Giant’s Causeway on the N coast: in 1973 it was replaced for administrative purposes by the districts of Antrim, Ballymena, Ballymoney, Carrickfergus, Larne, Moyle, Newtownabbey, and parts of Belfast and Lisburn. Area: 3100 sq km (1200 sq miles)
- a district of Northern Ireland, in Co Antrim. Pop: 49 260 (2003 est). Area: 415 sq km (160 sq miles)