Ynys Môn is a

constituency An electoral (congressional, legislative, etc.) district, sometimes called a constituency, riding, or ward, is a geographical portion of a political unit, such as a country, state or province, city, or administrative region, created to provi ...

of the

Senedd The Senedd ( ; ), officially known as the Welsh Parliament in English and () in Welsh, is the devolved, unicameral legislature of Wales. A democratically elected body, Its role is to scrutinise the Welsh Government and legislate on devolve ...

. It elects one

Member of the Senedd A member of the Senedd (MS; plural: ''MSs''; ; , plural: ) is a representative elected to the Senedd (Welsh Parliament; ). There are sixty members, with forty members chosen to represent individual Senedd constituency, Senedd constituencies, a ...

by the

first past the post First-past-the-post (FPTP)—also called choose-one, first-preference plurality (FPP), or simply plurality—is a single-winner voting rule. Voters mark one candidate as their favorite, or First-preference votes, first-preference, and the cand ...

method of election. Ynys Môn is also one of nine constituencies in the

North Wales North Wales ( ) is a Regions of Wales, region of Wales, encompassing its northernmost areas. It borders mid Wales to the south, England to the east, and the Irish Sea to the north and west. The area is highly mountainous and rural, with Snowdon ...

electoral region, which elects four additional members, in addition to nine constituency members, to produce a degree of

proportional representation Proportional representation (PR) refers to any electoral system under which subgroups of an electorate are reflected proportionately in the elected body. The concept applies mainly to political divisions (Political party, political parties) amon ...

for the region as a whole. It was represented from

1999 1999 was designated as the International Year of Older Persons. Events January * January 1 – The euro currency is established and the European Central Bank assumes its full powers. * January 3 – The Mars Polar Lander is launc ...

by Ieuan Wyn Jones, the former leader of

Plaid Cymru Plaid Cymru ( ; , ; officially Plaid Cymru – the Party of Wales, and often referred to simply as Plaid) is a centre-left, Welsh nationalist list of political parties in Wales, political party in Wales, committed to Welsh independence from th ...

. Jones resigned from the Assembly on 20 June 2013, triggering a

by-election A by-election, also known as a special election in the United States and the Philippines, or a bypoll in India, is an election used to fill an office that has become vacant between general elections. A vacancy may arise as a result of an incumben ...

, which was held on 1 August 2013. Plaid Cymru's candidate Rhun ap Iorwerth comfortably held the seat for the party with a majority of over 9000 votes.

Boundaries

The constituency was created for the first election to the Assembly, in 1999, with the name and boundaries of the Ynys Môn Westminster constituency. It is entirely within the preserved county of

Gwynedd Gwynedd () is a county in the north-west of Wales. It borders Anglesey across the Menai Strait to the north, Conwy, Denbighshire, and Powys to the east, Ceredigion over the Dyfi estuary to the south, and the Irish Sea to the west. The ci ...

. As created in 1999, the North Wales region includes the constituencies of Alyn and Deeside,

Caernarfon Caernarfon (; ) is a List of place names with royal patronage in the United Kingdom, royal town, Community (Wales), community and port in Gwynedd, Wales. It has a population of 9,852 (with Caeathro). It lies along the A487 road, on the easter ...

, Clwyd West, Clwyd South,

Conwy Conwy (, ), previously known in English as Conway, is a walled market town, community and the administrative centre of Conwy County Borough in North Wales. The walled town and castle stand on the west bank of the River Conwy, facing Deganwy ...

, Delyn, Vale of Clwyd,

Wrexham Wrexham ( ; ) is a city status in the United Kingdom, city in the North East Wales, north-east of Wales. It lies between the Cambrian Mountains, Welsh mountains and the lower River Dee, Wales, Dee Valley, near the England–Wales border, borde ...

and Ynys Môn. From the 2007 Assembly election the region included Aberconwy, Alyn and Deeside, Arfon, Clwyd South, Clwyd West, Delyn, Vale of Clwyd,

and Ynys Môn.

Voting

In elections for the Senedd, each voter has two votes. The first vote may be used to vote for a candidate to become the Assembly Member for the voter's constituency, elected by the first past the post system. The second vote may be used to vote for a regional

closed party list Closed list describes the variant of party-list systems where voters can effectively vote for only political parties as a whole; thus they have no influence on the party-supplied order in which party candidates are elected. If voters had some in ...

of candidates. Additional member seats are allocated from the lists by the

d'Hondt method The D'Hondt method, also called the Jefferson method or the greatest divisors method, is an apportionment method for allocating seats in parliaments among federal states, or in proportional representation among political parties. It belongs to ...

, with constituency results being taken into account in the allocation.

Assembly Members and Members of the Senedd

Elections

Elections in the 2020s

Elections in the 2010s

Regional ballots rejected at the count: 144

Elections in the 2000s

2003 Electorate: 49,998
Regional ballots rejected: 239

Elections in the 1990s

References

{{DEFAULTSORT:Ynys Mon (Assembly constituency) Senedd constituencies in the North Wales electoral region Politics of Anglesey 1999 establishments in Wales Constituencies established in 1999