List of parliamentary constituencies in Northern Ireland

[1] Parliamentary constituencies are not used for local government, which is instead carried out by 11 district councils; these often have different boundaries.

Changes are dated in the header row: either a general election (four-figure year, bold, link) or by-election or change in affiliation (two-figure year, italic, link or details appear on hover).

Tory Whig Tory Whig * Sir George Hill, 2nd Baronet, was elected to sit as MP for both Coleraine and Londonderry City in the 1806 general election and chose to continue to sit for Londonderry City, hence the 1807 by-election, in which Walter Jones was restored to his seat.

Tory Whig * The Parliaments of England by Henry Stooks Smith suggests that after the 1806 election there was a petition, which led to Edward Southwell Ruthven (Whig) being unseated and John Wilson Croker (Tory) being declared duly elected.

Parliamentary Election Results in Ireland, 1801–1922, edited by BM Walker, does not make any reference to such a petition.

The 1st Periodic Review boundary map can be viewed on the ARK elections website.

All of the others have undergone boundary changes, primarily to bring the electorate within the range of 69,724 to 77,062 as required by the Parliamentary Constituencies Act 1986 (as amended in 2020).

Under the Second Periodic Review, the following configuration of constituencies was adopted in November 1970, after the general election earlier that year.

The First Periodic Review, which reported in 1954 and took effect at the 1955 United Kingdom general election, made no changes whatsoever to the number of Northern Ireland constituencies, nor to their boundaries.