Category:Districts of Northern Ireland by century

• Northern Ireland in the 20th century by district‎ (20 C)
• Northern Ireland in the 21st century by district‎ (41 C)

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• Former districts of Northern Ireland by century‎ (18 C)

A

• Antrim and Newtownabbey by century‎ (1 C)
• Ards and North Down by century‎ (2 C)
• Armagh by century‎ (3 C)
• Armagh, Banbridge and Craigavon by century‎ (5 C)

B

• Belfast by century‎ (6 C, 1 F)

C

• Castlereagh by century‎ (1 C)
• Causeway Coast and Glens by century‎ (1 C)
• Craigavon (district) by century‎ (3 C)

D

• Derry (district) by century‎ (3 C)
• Derry and Strabane by century‎ (3 C)
• Down (district) by century‎ (1 C)
• Dungannon and South Tyrone by century‎ (1 C)

F

• Fermanagh and Omagh by century‎ (3 C)

L

• Larne by century‎ (2 C)
• Lisburn (district) by century‎ (3 C)
• Lisburn and Castlereagh by century‎ (4 C)

M

• Mid and East Antrim by century‎ (4 C)
• Mid-Ulster by century‎ (2 C)

N

• Newry and Mourne by century‎ (1 C)
• Newry, Mourne and Down by century‎ (1 C)
• North Down by century‎ (2 C)