Elections in Northern Ireland
Elections in Northern Ireland are held on a regular basis to local councils, the Northern Ireland Assembly and to the Parliament of the United Kingdom.
The Northern Ireland Assembly has 90 members, elected in 18 five-member constituencies by the single transferable vote method. Northern Ireland is represented at Westminster by 18 single-member constituencies elected by the first-past-the-post method.
Unlike in the rest of the United Kingdom, elections in Northern Ireland are administered centrally by the Chief Electoral Officer for Northern Ireland and the Electoral Office for Northern Ireland rather than by local authorities.
Elections to the United Kingdom House of Commons
;Legend: U: Unionist; N: Nationalist; O: Other.| Election | DUP | SF | UUP | SDLP | APNI | UKUP | UPUP | UUUP | VUPP | RLP | PUP | Unity | NP | Lab | Ind U | Ind N | Ind Lab | Total | Total U | Total N | Total O |
| Election | |||||||||||||||||||||
| 1922 | 11 | 2 | 13 | 11 | 2 | ||||||||||||||||
| 1923 | 11 | 2 | 13 | 11 | 2 | ||||||||||||||||
| 1924 | 13 | 13 | 13 | ||||||||||||||||||
| 1929 | 11 | 2 | 13 | 11 | 2 | ||||||||||||||||
| 1931 | 11 | 2 | 13 | 11 | 2 | ||||||||||||||||
| 1935 | 11 | 2 | 13 | 11 | 2 | ||||||||||||||||
| 1945 | 9 | 2 | 1 | 1 | 13 | 10 | 2 | 1 | |||||||||||||
| 1950 | 10 | 2 | 12 | 10 | 2 | ||||||||||||||||
| 1951 | 9 | 2 | 1 | 12 | 9 | 2 | 1 | ||||||||||||||
| 1955 | 2 | 10 | 12 | 10 | 2 | ||||||||||||||||
| 1959 | 12 | 12 | 12 | ||||||||||||||||||
| 1964 | 12 | 12 | 12 | ||||||||||||||||||
| 1966 | 11 | 1 | 12 | 11 | 1 | ||||||||||||||||
| 1970 | 8 | 1 | 1 | 2 | 12 | 9 | 3 | ||||||||||||||
| 1 | 7 | 1 | 3 | 12 | 11 | 1 | |||||||||||||||
| 1 | 6 | 1 | 3 | 1 | 12 | 10 | 2 | ||||||||||||||
| 1979 | 3 | 5 | 1 | 1 | 1 | 1 | 12 | 10 | 2 | ||||||||||||
| 1983 | 3 | 1 | 11 | 1 | 1 | 17 | 15 | 2 | |||||||||||||
| 1987 | 3 | 1 | 9 | 3 | 1 | 17 | 13 | 4 | |||||||||||||
| 1992 | 3 | 9 | 4 | 1 | 17 | 13 | 4 | ||||||||||||||
| 1997 | 2 | 2 | 10 | 3 | 1 | 18 | 13 | 5 | |||||||||||||
| 2001 | 5 | 4 | 6 | 3 | 18 | 11 | 7 | ||||||||||||||
| 2005 | 9 | 5 | 1 | 3 | 18 | 10 | 8 | ||||||||||||||
| 2010 | 8 | 5 | 3 | 1 | 1 | 18 | 9 | 8 | 1 | ||||||||||||
| 2015 | 8 | 4 | 2 | 3 | 1 | 18 | 11 | 7 | |||||||||||||
| 2017 | 10 | 7 | 1 | 18 | 11 | 7 | |||||||||||||||
| 2019 | 8 | 7 | 2 | 1 | 18 | 8 | 9 | 1 |
- Sinn Féin have never taken their seats in the United Kingdom House of Commons due to their policy of abstentionism.
- UUP MPs sat as members of the Conservative Party until 1972.
By-elections
Recall petition
- 2018 North Antrim recall petition
Referendums
Northern Ireland–specific referendums
- 1973 Northern Ireland border poll
- 1998 Northern Ireland Good Friday Agreement referendum
United Kingdom–wide referendums
- 1975 United Kingdom European Communities membership referendum#Results by United Kingdom constituent countries
- 2011 United Kingdom Alternative Vote referendum#Results by constituent countries
- 2016 United Kingdom European Union membership referendum#Results by constituent countries
Elections to the Northern Ireland Assembly
| Election | DUP | SF | UUP | SDLP | APNI | UKUP | UPUP | PUP | VUPP | UPNI | NILP | NIWC | GPNI | TUV | PBP | Ind U | Ind N | Ind O | Total | Total U | Total N | Total O | - |
| Election | - | ||||||||||||||||||||||
| 1973 | 8 | 31 | 19 | 8 | 7 | 1 | 4 | 78 | 50 | 19 | 9 | ||||||||||||
| 1975 | 12 | 19 | 17 | 8 | 14 | 5 | 1 | 2 | 78 | 52 | 17 | 9 | |||||||||||
| 1982 | 21 | 5 | 26 | 14 | 10 | 1 | 1 | 78 | 49 | 19 | 10 | ||||||||||||
| 1998 | 20 | 18 | 28 | 24 | 6 | 5 | 2 | 2 | 3 | 108 | 58 | 42 | 8 | ||||||||||
| 2003 | 30 | 24 | 27 | 18 | 6 | 1 | 1 | 1 | 108 | 59 | 42 | 7 | |||||||||||
| 2007 | 36 | 28 | 18 | 16 | 7 | 1 | 1 | 1 | 108 | 55 | 44 | 9 | |||||||||||
| 2011 | 38 | 29 | 16 | 14 | 8 | 1 | 1 | 1 | 108 | 54 | 45 | 9 | |||||||||||
| 2016 | 38 | 28 | 16 | 12 | 8 | 2 | 1 | 2 | 1 | 108 | 58 | 40 | 12 | ||||||||||
| 2017 | 28 | 27 | 10 | 12 | 8 | 2 | 1 | 1 | 1 | 90 | 40 | 39 | 11 |
- 1998 Northern Ireland Assembly election
- 2003 Northern Ireland Assembly election
- 2007 Northern Ireland Assembly election
- 2011 Northern Ireland Assembly election
- 2016 Northern Ireland Assembly election
- 2017 Northern Ireland Assembly election
Elections to the European Parliament
| Year | |||||
| Year | DUP | SF | APNI | UUP | SDLP |
| 1979 | 1 | 0 | 0 | 1 | 1 |
| 1984 | 1 | 0 | 0 | 1 | 1 |
| 1989 | 1 | 0 | 0 | 1 | 1 |
| 1994 | 1 | 0 | 0 | 1 | 1 |
| 1999 | 1 | 0 | 0 | 1 | 1 |
| 2004 | 1 | 1 | 0 | 1 | 0 |
| 2009 | 1 | 1 | 0 | 1 | 0 |
| 2014 | 1 | 1 | 0 | 1 | 0 |
| 2019 | 1 | 1 | 1 | 0 | 0 |
Ad hoc elections
- 1973 Northern Ireland Assembly election
- Northern Ireland Constitutional Convention
- 1982 Northern Ireland Assembly election
- Northern Ireland Forum
Elections to the Northern Ireland House of Commons
- 1921 Northern Ireland general election
- 1925 Northern Ireland general election
- 1929 Northern Ireland general election
- 1933 Northern Ireland general election
- 1938 Northern Ireland general election
- 1945 Northern Ireland general election
- 1949 Northern Ireland general election
- 1953 Northern Ireland general election
- 1958 Northern Ireland general election
- 1962 Northern Ireland general election
- 1965 Northern Ireland general election
- 1969 Northern Ireland general election
By-elections
- List of Northern Ireland Parliament by-elections
Local elections
- 1973 Northern Ireland local elections
- 1977 Northern Ireland local elections
- 1981 Northern Ireland local elections
- 1985 Northern Ireland local elections
- 1989 Northern Ireland local elections
- 1993 Northern Ireland local elections
- 1997 Northern Ireland local elections
- 2001 Northern Ireland local elections
- 2005 Northern Ireland local elections
- 2011 Northern Ireland local elections
- 2014 Northern Ireland local elections
- 2019 Northern Ireland local elections