The Ulster Unionist Party held the majority of Northern Ireland seats in most elections for the Westminster Parliament between 1922 and 2001. Since then its representation has been low or non-existent, having been eclipsed by the Democratic Unionist Party.^[1] It always had an absolute majority in the Stormont Parliament (1921–1972); since that Parliament was replaced by the Northern Ireland Assembly it has had a substantial minority representation there.^[2] Its share of the vote in Northern Ireland local government elections has tended to diminish, so that there too it is no longer the largest party.^[3] Finally, the party has always held one of the three Northern Ireland seats in the European Parliament. Its share of the Northern Ireland vote in the most recent elections to these bodies has been between 10.5% (Westminster 2017)^[4] and 16.1% (local government, 2014).^[5]

Westminster

Election	House of Commons	Share of votes	Seats	+/-
1922[6]	32nd	51.9%	11 / 13
1923[7]	33rd	48.4%	11 / 13
1924[8]	34th	86.9%	13 / 13	2
1929[9]	35th	69.5%	11 / 13	2
1931[10]	36th	53.0%	11 / 13
1935[11]	37th	64.9%	11 / 13
1945[12]	38th	54.6%	9 / 13	2
1950[13]	39th	62.8%	10 / 12	1
1951[14]	40th	59.4%	9 / 12	1
1955[15]	41st	68.5%	10 / 12	1
1959[16]	42nd	77.2%	12 / 12	2
1964[17]	43rd	63.2%	12 / 12
1966[18]	44th	61.8%	9 / 12	3
1970[19]	45th	54.2%	8 / 12	1
1974 (Feb)[20]	46th	32.3%	7 / 12	1
1974 (Oct)[21]	47th	36.5%	6 / 12	1
1979[22]	48th	36.6%	5 / 12	1
1983[23]	49th	34.0%	11 / 17	6
1987[24]	50th	37.8%	9 / 17	2
1992[25]	51st	34.5%	9 / 17
1997[26]	52nd	32.7%	10 / 18	1
2001[27]	53rd	26.7%	6 / 18	4
2005[28]	54th	17.7%	1 / 18	5
2010[29]	55th	15.2%	0 / 18	1
2015[30]	56th	16.0%	2 / 18	2
2017[4]	57th	10.5%	0 / 18	2
2019[31]	58th	11.7%	0 / 18

Stormont

Election	Body	First Preference Vote	Vote %	Seats	+/-
1921[32]	1st Parliament	343,347	66.9%	40 / 52
1925[32]	2nd Parliament	211,662	55.0%	32 / 52	8
1929[32]	3rd Parliament	148,579	50.8%	37 / 52	5
1933[32]	4th Parliament	73,791	43.5%	36 / 52	1
1938[32]	5th Parliament	187,684	56.8%	39 / 52	3
1945[32]	6th Parliament	180,342	50.4%	33 / 52	6
1949[32]	7th Parliament	237,411	62.7%	37 / 52	4
1953[32]	8th Parliament	125,379	48.6%	38 / 52	1
1958[32]	9th Parliament	106,177	44.0%	37 / 52	1
1962 [32]	10th Parliament	147,629	48.8%	34 / 52	3
1965[32]	11th Parliament	191,896	59.1%	36 / 52	2
1969 [32]	12th Parliament	269,501	48.2%	36 / 52
1973[33][34]	1973 Assembly	258,790	35.8%	31 / 78	5
1975[35]	Constitutional Convention	167,214	25.4%	19 / 78	12
1982[36]	1982 Assembly	188,277	29.7%	26 / 78	7
1996[37]	Forum	181,829	24.2%	30 / 110
1998[38]	1st Assembly	172,225	21.3%	28 / 108	2
2003[39]	2nd Assembly	156,931	22.7%	27 / 108	1
2007[40]	3rd Assembly	103,145	14.9%	18 / 108	9
2011[41]	4th Assembly	87,531	13.2%	16 / 108	2
2016[42]	5th Assembly	87,302	12.6%	16 / 108
2017[43]	6th Assembly	103,314	12.9%	10 / 90	6
2022[44]	7th Assembly	96,390	11.2%	9 / 90	1

Local government

European Parliament