List of parliamentary constituencies in Gwynedd

There are four constituencies covering the preserved county of Gwynedd. They are all county constituencies (CCs) of the House of Commons of the Parliament of the United Kingdom (Westminster), and are used also for elections to the National Assembly for Wales. The current boundaries have been effective since the Welsh Assembly election, 2007 and the 2010 United Kingdom general election.

The preserved county of Gwynedd shares its name with the principal area of Gwynedd, although the preserved county also covers Anglesey.

For Welsh Assembly elections, constituencies are grouped into additional member electoral regions, and changes to constituency boundaries mean, also, changes to regional boundaries.

Westminster boundaries

From 2010

Constituency	Boundaries
1. Arfon CC (Westminster)	Parliamentary constituencies in Gwynedd 2010
2. Dwyfor Meirionnydd CC (Westminster)
3. Ynys Môn CC (Westminster)

1997 to 2010

Constituency	Boundaries
1. Caernarfon CC (Westminster)	Parliamentary constituencies in Gwynedd pre-2010
2. Conwy CC (Westminster) (part)
3. Meirionnydd Nant Conwy CC (Westminster) (part)
4. Ynys Môn CC (Westminster)

Changes proposed in 2016

As part of the Sixth Periodic Review of Westminster constituencies the Boundary Commission for Wales proposed changes to almost all the existing Welsh Westminster constituencies, giving some of them Welsh language names.

• Ynys Môn ac Arfon
• Gogledd Clwyd a Gwynedd
• Colwyn and Conwy

Assembly boundaries

From 2007

Constituency	Assembly region	Constituency boundaries
1. Arfon CC (Assembly)	North Wales	Assembly constituencies in Gwynedd 2007
2. Dwyfor Meirionnydd CC (Assembly)	Mid and West Wales
3. Ynys Môn CC (Assembly)	North Wales

The North Wales region also includes seven Clwyd constituencies. The Mid and West Wales region also includes five Dyfed constituencies and two Powys constituencies.

1999 to 2007

Constituency	Assembly region	Constituency boundaries
1. Caernarfon CC (Assembly)	North Wales	Assembly constituencies in Gwynedd pre-2007
2. Conwy CC (Assembly) (part)
3. Meirionnydd Nant Conwy CC (Assembly) (part)	Mid and West Wales
4. Ynys Môn CC (Assembly)	North Wales

Historical representation by party

Before 1974 this table covers the historic counties of Anglesey, Carnarvonshire and Merionethshire.

1885 to 1918

Constituency	1885	1886	90	1892	1895	99	1900	1906	Jan 1910	Dec 1910	15	1918	1922	1923	1924	1929	1931	1935	45	1945
Anglesey	bgcolor="Template:Liberal Party (UK)/meta/color" |Davies	colspan="3" bgcolor="Template:Liberal Party (UK)/meta/color" |Lewis	colspan="7" bgcolor="Template:Liberal Party (UK)/meta/color" |Ellis-Griffith	colspan="2" bgcolor="Template:Independent Labour/meta/color" |O. Thomas	colspan="2" bgcolor="Template:Liberal Party (UK)/meta/color" |R. Thomas	colspan="5" bgcolor="Template:Liberal Party (UK)/meta/color" |M. Lloyd George
Arfon (1885-1918) / Carnarvonshire (1918-50)	colspan="4" bgcolor="Template:Liberal Party (UK)/meta/color" |Rathbone	colspan="6" bgcolor="Template:Liberal Party (UK)/meta/color" |Jones	bgcolor="Template:Liberal Party (UK)/meta/color"|Rees	bgcolor="Template:Coalition Liberal/meta/color" |Breese	bgcolor="Template:Labour Party (UK)/meta/color" |Jones	colspan="6" bgcolor="Template:Liberal Party (UK)/meta/color" |Owen	bgcolor="Template:Labour Party (UK)/meta/color" |G. Roberts
Carnarvon	bgcolor="Template:Liberal Party (UK)/meta/color" |Jones-Parry	bgcolor="Template:Conservative Party (UK)/meta/color" |Swetenham	colspan="9" bgcolor="Template:Liberal Party (UK)/meta/color"|D. Lloyd George	colspan="2" bgcolor="Template:Coalition Liberal/meta/color" |-->	colspan="5" bgcolor="Template:Liberal Party (UK)/meta/color" |-->	bgcolor="Template:Liberal Party (UK)/meta/color"|Davies	bgcolor="Template:Conservative Party (UK)/meta/color" |Price-White
Eifion	colspan="7" bgcolor="Template:Liberal Party (UK)/meta/color" |Roberts	colspan="4" bgcolor="Template:Liberal Party (UK)/meta/color" |Davies
Merionethshire	bgcolor="Template:Liberal Party (UK)/meta/color" |Robertson	colspan="4" bgcolor="Template:Liberal Party (UK)/meta/color" |Ellis	bgcolor="Template:Liberal Party (UK)/meta/color"|Edwards	colspan="2" bgcolor="Template:Liberal Party (UK)/meta/color" |Williams	colspan="11" bgcolor="Template:Liberal Party (UK)/meta/color" |Haydn Jones	bgcolor="Template:Liberal Party (UK)/meta/color" |E. Roberts

1950 to 1974

Constituency	1950	1951	1955	1959	1964	1966	1970	Feb 1974	Oct 1974	1979	1983	1987	1992	1997	2001	2005	2010	2015
Anglesey / Ynys Môn (1983-)	bgcolor="Template:Liberal Party (UK)/meta/color" |Lloyd George	colspan="8" bgcolor="Template:Labour Party (UK)/meta/color" |Hughes	colspan="2" bgcolor="Template:Conservative Party (UK)/meta/color" |Best	colspan="3" bgcolor="Template:Plaid Cymru/meta/color" |Wyn Jones	colspan="4" bgcolor="Template:Labour Party (UK)/meta/color" |Owen
Caernarfon / Arfon (2010-)	colspan="7" bgcolor="Template:Labour Party (UK)/meta/color" |G. Roberts	colspan="7" bgcolor="Template:Plaid Cymru/meta/color" |Wigley	colspan="4" bgcolor="Template:Plaid Cymru/meta/color" |H. Williams
Conway	bgcolor="Template:Labour Party (UK)/meta/color" |W. Jones	colspan="4" bgcolor="Template:Conservative Party (UK)/meta/color" |Thomas	bgcolor="Template:Labour Party (UK)/meta/color" |Davies	colspan="7" bgcolor="Template:Conservative Party (UK)/meta/color" |W. Roberts	colspan="3" bgcolor="Template:Labour Party (UK)/meta/color" |B. Williams	moved to Clwyd
Merionethshire / Meirionnydd Nant Conwy (1983-2010) / Dwyfor Meirionnydd (from 2010)	bgcolor="Template:Liberal Party (UK)/meta/color" |E. Roberts	colspan="4" bgcolor="Template:Labour Party (UK)/meta/color" |T. Jones	colspan="2" bgcolor="Template:Labour Party (UK)/meta/color" |Edwards	colspan="5" bgcolor="Template:Plaid Cymru/meta/color" |Thomas	colspan="5" bgcolor="Template:Plaid Cymru/meta/color" |Llwyd	bgcolor="Template:Plaid Cymru/meta/color" |Saville-Roberts