Boundary set for Wales (13 April 2010 - 30 May 2024) Majorities

Constituency areas Establishing legislation General elections By-elections Majorities Vote shares of winning candidate Turnouts General election party performance

Constituency area	Election type	Polling date	Winning party	Majority	Valid vote count	Majority / valid vote count
Aberavon	General election	6 May 2010	Lab	11,039	30,958	35.7%
Aberavon	General election	7 May 2015	Lab	10,445	31,523	33.1%
Aberavon	General election	8 June 2017	Lab	16,761	33,268	50.4%
Aberavon	General election	12 December 2019	Lab	10,490	31,598	33.2%
Aberconwy	General election	6 May 2010	Con	3,398	29,966	11.3%
Aberconwy	General election	7 May 2015	Con	3,999	30,148	13.3%
Aberconwy	General election	8 June 2017	Con	635	32,150	2.0%
Aberconwy	General election	12 December 2019	Con	2,034	31,865	6.4%
Alyn and Deeside	General election	6 May 2010	Lab	2,919	39,923	7.3%
Alyn and Deeside	General election	7 May 2015	Lab	3,343	41,314	8.1%
Alyn and Deeside	General election	8 June 2017	Lab	5,235	44,760	11.7%
Alyn and Deeside	General election	12 December 2019	Lab	213	43,008	0.5%
Arfon	General election	6 May 2010	PC	1,455	26,078	5.6%
Arfon	General election	7 May 2015	PC	3,668	26,837	13.7%
Arfon	General election	8 June 2017	PC	92	28,208	0.3%
Arfon	General election	12 December 2019	PC	2,781	29,074	9.6%
Blaenau Gwent	General election	6 May 2010	Lab	10,516	32,395	32.5%
Blaenau Gwent	General election	7 May 2015	Lab	12,703	31,683	40.1%
Blaenau Gwent	General election	8 June 2017	Lab	11,907	32,384	36.8%
Blaenau Gwent	General election	12 December 2019	Lab	8,647	30,219	28.6%
Brecon and Radnorshire	General election	6 May 2010	LD	3,747	38,845	9.6%
Brecon and Radnorshire	General election	7 May 2015	Con	5,102	40,074	12.7%
Brecon and Radnorshire	General election	8 June 2017	Con	8,038	41,334	19.4%
Brecon and Radnorshire	General election	12 December 2019	Con	7,131	41,319	17.3%
Bridgend	General election	6 May 2010	Lab	2,263	38,347	5.9%
Bridgend	General election	7 May 2015	Lab	1,927	39,453	4.9%
Bridgend	General election	8 June 2017	Lab	4,700	43,255	10.9%
Bridgend	General election	12 December 2019	Con	1,157	42,236	2.7%
Caerphilly	General election	6 May 2010	Lab	10,755	38,692	27.8%
Caerphilly	General election	7 May 2015	Lab	10,073	40,283	25.0%
Caerphilly	General election	8 June 2017	Lab	12,078	41,297	29.2%
Caerphilly	General election	12 December 2019	Lab	6,833	40,117	17.0%
Cardiff Central	General election	6 May 2010	LD	4,576	36,151	12.7%
Cardiff Central	General election	7 May 2015	Lab	4,981	38,646	12.9%
Cardiff Central	General election	8 June 2017	Lab	17,196	40,367	42.6%
Cardiff Central	General election	12 December 2019	Lab	17,179	41,822	41.1%
Cardiff North	General election	6 May 2010	Con	194	47,630	0.4%
Cardiff North	General election	7 May 2015	Con	2,137	51,151	4.2%
Cardiff North	General election	8 June 2017	Lab	4,174	52,022	8.0%
Cardiff North	General election	12 December 2019	Lab	6,982	52,666	13.3%
Cardiff South and Penarth	General election	6 May 2010	Lab / Co-op	4,709	44,369	10.6%
Cardiff South and Penarth	General election	7 May 2015	Lab / Co-op	7,453	46,667	16.0%
Cardiff South and Penarth	General election	8 June 2017	Lab / Co-op	14,864	50,736	29.3%
Cardiff South and Penarth	General election	12 December 2019	Lab / Co-op	12,737	50,579	25.2%
Cardiff West	General election	6 May 2010	Lab	4,751	40,958	11.6%
Cardiff West	General election	7 May 2015	Lab	6,789	43,792	15.5%
Cardiff West	General election	8 June 2017	Lab	12,551	46,629	26.9%
Cardiff West	General election	12 December 2019	Lab	10,986	46,177	23.8%
Carmarthen East and Dinefwr	General election	6 May 2010	PC	3,481	38,011	9.2%
Carmarthen East and Dinefwr	General election	7 May 2015	PC	5,599	39,399	14.2%
Carmarthen East and Dinefwr	General election	8 June 2017	PC	3,908	41,029	9.5%
Carmarthen East and Dinefwr	General election	12 December 2019	PC	1,809	41,002	4.4%
Carmarthen West and South Pembrokeshire	General election	6 May 2010	Con	3,423	40,507	8.5%
Carmarthen West and South Pembrokeshire	General election	7 May 2015	Con	6,054	40,350	15.0%
Carmarthen West and South Pembrokeshire	General election	8 June 2017	Con	3,110	42,226	7.4%
Carmarthen West and South Pembrokeshire	General election	12 December 2019	Con	7,745	42,114	18.4%
Ceredigion	General election	6 May 2010	LD	8,324	38,258	21.8%
Ceredigion	General election	7 May 2015	LD	3,067	37,416	8.2%
Ceredigion	General election	8 June 2017	PC	104	39,767	0.3%
Ceredigion	General election	12 December 2019	PC	6,329	40,105	15.8%
Clwyd South	General election	6 May 2010	Lab	2,834	34,681	8.2%
Clwyd South	General election	7 May 2015	Lab	2,402	35,064	6.9%
Clwyd South	General election	8 June 2017	Lab	4,356	37,474	11.6%
Clwyd South	General election	12 December 2019	Con	1,239	36,306	3.4%
Clwyd West	General election	6 May 2010	Con	6,419	38,111	16.8%
Clwyd West	General election	7 May 2015	Con	6,730	38,028	17.7%
Clwyd West	General election	8 June 2017	Con	3,437	40,654	8.5%
Clwyd West	General election	12 December 2019	Con	6,747	40,203	16.8%
Cynon Valley	General election	6 May 2010	Lab	9,617	29,876	32.2%
Cynon Valley	General election	7 May 2015	Lab	9,406	30,472	30.9%
Cynon Valley	General election	8 June 2017	Lab	13,238	31,802	41.6%
Cynon Valley	General election	12 December 2019	Lab	8,822	30,236	29.2%
Delyn	General election	6 May 2010	Lab	2,272	36,984	6.1%
Delyn	General election	7 May 2015	Lab	2,930	37,457	7.8%
Delyn	General election	8 June 2017	Lab	4,240	39,418	10.8%
Delyn	General election	12 December 2019	Con	865	38,370	2.3%
Dwyfor Meirionnydd	General election	6 May 2010	PC	6,367	28,906	22.0%
Dwyfor Meirionnydd	General election	7 May 2015	PC	5,261	28,913	18.2%
Dwyfor Meirionnydd	General election	8 June 2017	PC	4,850	30,348	16.0%
Dwyfor Meirionnydd	General election	12 December 2019	PC	4,740	29,928	15.8%
Gower	General election	6 May 2010	Lab	2,683	41,671	6.4%
Gower	General election	7 May 2015	Con	27	42,758	0.1%
Gower	General election	8 June 2017	Lab	3,269	45,576	7.2%
Gower	General election	12 December 2019	Lab	1,837	44,482	4.1%
Islwyn	General election	6 May 2010	Lab / Co-op	12,215	34,684	35.2%
Islwyn	General election	7 May 2015	Lab / Co-op	10,404	35,401	29.4%
Islwyn	General election	8 June 2017	Lab / Co-op	11,412	36,093	31.6%
Islwyn	General election	12 December 2019	Lab / Co-op	5,464	34,350	15.9%
Llanelli	General election	6 May 2010	Lab	4,701	37,461	12.5%
Llanelli	General election	7 May 2015	Lab	7,095	38,574	18.4%
Llanelli	General election	8 June 2017	Lab	12,024	40,342	29.8%
Llanelli	General election	12 December 2019	Lab	4,670	38,233	12.2%
Merthyr Tydfil and Rhymney	General election	6 May 2010	Lab	4,056	32,076	12.6%
Merthyr Tydfil and Rhymney	General election	7 May 2015	Lab	11,513	32,715	35.2%
Merthyr Tydfil and Rhymney	General election	8 June 2017	Lab	16,334	33,545	48.7%
Merthyr Tydfil and Rhymney	General election	12 December 2019	Lab	10,606	32,246	32.9%
Monmouth	General election	6 May 2010	Con	10,425	46,519	22.4%
Monmouth	General election	7 May 2015	Con	10,982	47,462	23.1%
Monmouth	General election	8 June 2017	Con	8,206	49,734	16.5%
Monmouth	General election	12 December 2019	Con	9,982	50,217	19.9%
Montgomeryshire	General election	6 May 2010	Con	1,184	33,813	3.5%
Montgomeryshire	General election	7 May 2015	Con	5,325	33,757	15.8%
Montgomeryshire	General election	8 June 2017	Con	9,285	34,891	26.6%
Montgomeryshire	General election	12 December 2019	Con	12,138	34,214	35.5%
Neath	General election	6 May 2010	Lab	9,775	37,122	26.3%
Neath	General election	7 May 2015	Lab	9,548	37,135	25.7%
Neath	General election	8 June 2017	Lab / Co-op	12,631	38,285	33.0%
Neath	General election	12 December 2019	Lab / Co-op	5,637	36,756	15.3%
Newport East	General election	6 May 2010	Lab	1,650	34,448	4.8%
Newport East	General election	7 May 2015	Lab	4,705	35,108	13.4%
Newport East	General election	8 June 2017	Lab	8,003	36,820	21.7%
Newport East	General election	12 December 2019	Lab	1,992	36,282	5.5%
Newport West	General election	6 May 2010	Lab	3,544	39,720	8.9%
Newport West	General election	7 May 2015	Lab	3,510	40,347	8.7%
Newport West	General election	8 June 2017	Lab	5,658	43,438	13.0%
Newport West	General election	12 December 2019	Lab	902	43,433	2.1%
Ogmore	General election	6 May 2010	Lab	13,246	34,650	38.2%
Ogmore	General election	7 May 2015	Lab	13,043	35,250	37.0%
Ogmore	General election	8 June 2017	Lab	13,871	37,204	37.3%
Ogmore	General election	12 December 2019	Lab	7,805	35,390	22.1%
Pontypridd	General election	6 May 2010	Lab	2,785	36,671	7.6%
Pontypridd	General election	7 May 2015	Lab	8,985	37,882	23.7%
Pontypridd	General election	8 June 2017	Lab	11,448	39,894	28.7%
Pontypridd	General election	12 December 2019	Lab	5,887	39,060	15.1%
Preseli Pembrokeshire	General election	6 May 2010	Con	4,605	39,602	11.6%
Preseli Pembrokeshire	General election	7 May 2015	Con	4,969	40,556	12.3%
Preseli Pembrokeshire	General election	8 June 2017	Con	314	42,197	0.7%
Preseli Pembrokeshire	General election	12 December 2019	Con	5,062	42,419	11.9%
Rhondda	General election	6 May 2010	Lab	11,553	31,072	37.2%
Rhondda	General election	7 May 2015	Lab	7,455	31,538	23.6%
Rhondda	General election	8 June 2017	Lab	13,746	32,936	41.7%
Rhondda	General election	12 December 2019	Lab	11,440	29,642	38.6%
Swansea East	General election	6 May 2010	Lab	10,838	32,676	33.2%
Swansea East	General election	7 May 2015	Lab	12,028	33,618	35.8%
Swansea East	General election	8 June 2017	Lab	13,168	35,159	37.5%
Swansea East	General election	12 December 2019	Lab	7,970	33,579	23.7%
Swansea West	General election	6 May 2010	Lab / Co-op	504	35,593	1.4%
Swansea West	General election	7 May 2015	Lab / Co-op	7,036	35,156	20.0%
Swansea West	General election	8 June 2017	Lab / Co-op	10,598	37,282	28.4%
Swansea West	General election	12 December 2019	Lab / Co-op	8,116	35,830	22.7%
Torfaen	General election	6 May 2010	Lab	9,306	37,640	24.7%
Torfaen	General election	7 May 2015	Lab	8,169	37,937	21.5%
Torfaen	General election	8 June 2017	Lab	10,240	38,429	26.6%
Torfaen	General election	12 December 2019	Lab	3,742	37,176	10.1%
Vale Of Clwyd	General election	6 May 2010	Lab	2,509	35,534	7.1%
Vale Of Clwyd	General election	7 May 2015	Con	237	35,261	0.7%
Vale Of Clwyd	General election	8 June 2017	Lab	2,379	38,684	6.1%
Vale Of Clwyd	General election	12 December 2019	Con	1,827	37,213	4.9%
Vale Of Glamorgan	General election	6 May 2010	Con	4,307	48,667	8.8%
Vale Of Glamorgan	General election	7 May 2015	Con	6,880	51,293	13.4%
Vale Of Glamorgan	General election	8 June 2017	Con	2,190	53,718	4.1%
Vale Of Glamorgan	General election	12 December 2019	Con	3,562	54,807	6.5%
Wrexham	General election	6 May 2010	Lab	3,658	32,976	11.1%
Wrexham	General election	7 May 2015	Lab	1,831	32,719	5.6%
Wrexham	General election	8 June 2017	Lab	1,832	35,092	5.2%
Wrexham	General election	12 December 2019	Con	2,131	33,532	6.4%
Ynys Môn	General election	6 May 2010	Lab	2,461	34,444	7.1%
Ynys Môn	General election	7 May 2015	Lab	229	34,926	0.7%
Ynys Môn	General election	8 June 2017	Lab	5,259	37,367	14.1%
Ynys Môn	General election	12 December 2019	Con	1,968	36,552	5.4%