Who is the MP for Ynys Mon?

Llinos Medi (Plaid Cymru) is the MP for Ynys Mon. They were first elected in July 2024.

Who won Ynys Mon at the 2024 general election?

The 2024 general election in Ynys Mon was won by Plaid Cymru with 32.5% of the vote, ahead of Conservative on 30.5%.

Who is projected to win the next election in Ynys Mon?

PollCheck's current projection has Plaid Cymru on 42.1% and Conservative on 22.1% if a general election were held today. The projection updates as new polling is added.

What council is Ynys Mon in?

Ynys Mon sits within Isle of Anglesey council. Westminster constituencies and local councils are separate units, but Isle of Anglesey covers most or all of the Ynys Mon area.

What is the demographic profile of Ynys Mon?

Ynys Mon is in Wales. The seat is closely divided on Brexit (Leave vote estimated at 50.9% in 2016). Around 32.3% of residents have a degree, 31.5% aged 65 or over, and 68.2% of homes are owner-occupied (Census 2021).

When was the last general election in Ynys Mon?

The most recent general election was held on 4 July 2024. In Ynys Mon, Plaid Cymru won with 32.5% of the vote. The next general election must be held by August 2029.

Which parties have won Ynys Mon in recent elections?

Recent general election winners in Ynys Mon: 2010 Labour, 2015 Labour, 2017 Labour, 2019 Conservative, 2024 Plaid Cymru.

Constituency profile

Ynys Mon

Wales · County constituency · Isle of Anglesey borough

Sitting MP

Llinos Medi

Plaid Cymru

First elected July 2024

Current PollCheck projection

Region & type

Wales

County constituency, Isle of Anglesey council

Last 5 GE winners

LLLCPC

Labour 3/5, Conservative 1/5, Plaid Cymru 1/5

EU referendum 2016

50.9% Leave

UK average 51.9%; -1.0pp below mean

Current outlook

Plaid Cymru +20.0pp

vs Conservative 22.1%

WelshBrexit-marginal

Who lives in Ynys Mon? Constituency demographics

From the 2021 Census and 2016 EU referendum estimates. Constituency-level data on 2024 boundaries.

Leave vote 2016

50.9%

UK average ~52%

Degree or above

32.3%

UK average ~34%

No qualifications

18.0%

UK average ~18%

Owner-occupied

68.2%

UK average ~63%

Renting (social + private)

31.2%

UK average ~36%

Median age

UK median ~40

Age 65+

31.5%

UK average ~19%

Age 18-34

23.3%

UK average ~28%

How did Ynys Mon vote in 2024 and how would it vote now?

2024 vote shares from the HoC Library. Current projection is at the 7-poll average.

2024 general election

PC gain from Con · majority 637 votes (2.0pp) · turnout 61.4%

Current projection

If a general election were held today, at current poll average

Map of Ynys Mon

Switch between ward-level 2024 election winners and a demographic view. Ward winners are Britain Elects' / New Statesman modelled estimates with an average ~4pp margin of error per ward. The demographic view splits the seat into small neighbourhoods (around 1,500 residents each, from the 2021 Census). Hover any area for detail.

Senedd 2026 layer

How Ynys Mon voted at the Senedd election (7 May 2026)

Ynys Mon sits entirely within the Senedd constituency of Bangor Conwy Môn. Senedd elections use a closed-list proportional system; each Senedd seat returns six members.

Senedd constituency	Share of Ynys Mon	Winner	Runner-up	Seats (6 per constituency)
Bangor Conwy Môn	100%	Plaid Cymru 44.9%	Reform UK 28.1%	3 Plaid Cymru, 2 Reform UK, 1 Conservative

Senedd 2026 results from official declarations. Overlap percentages are area-based using the post-2024 Westminster boundary against the new 16-seat Senedd boundary.

Council layer (not Westminster)

Ynys Mon within Isle of Anglesey

The Westminster constituency of Ynys Mon sits entirely within Isle of Anglesey Council. Local council elections are a separate ballot from Westminster general elections - the figures below are from the council elections held on Thursday 7 May 2026.

Council overlap

Council	Share of seat
Isle of Anglesey 41 LSOAs	100%

Most recent council ward results

Latest council winner per ward. Where May 2026 elections happened, those are shown; otherwise the most recent year on the ward’s pre-2026 boundary (via DCLEAPIL, 2014-2024). The "Shift since GE2024" column is only computed for May 2026 results - earlier council votes pre-date the GE, so no directional shift is shown.

Loading ward results...

Ward	GE2024 winner	Latest council winner	Shift since GE2024	Turnout

Projection trajectory

PollCheck's projection for Ynys Mon at each of the last 60 GB polls. Hover the chart for the underlying poll details.

Who has won Ynys Mon at past general elections?

2024 result is on current boundaries. The 2019 row is the UK Parliament's notional recalculation onto the 2024 boundaries (directly comparable to 2024). The 2010, 2015 and 2017 rows are on the boundaries in force at the time and aren't directly comparable.

Year	Result	MP	Lab	Con	LD	Right (Ref/UKIP)	Green	Other	Majority	Turnout
2010	Lab hold	Albert Owen	33.4%	22.5%	7.5%	3.5% UKIP	-	6.9%	2,461	68.8%
2015	Lab hold	Albert Owen	31.1%	21.2%	2.2%	14.7% UKIP	-	0.4%	229	69.9%
2017	Lab hold	Albert Owen	41.9%	27.8%	1.3%	1.7% UKIP	-	-	5,259	70.6%
2019notional	Conservative winner	Virginia Crosbie 2019 MP, pre-review boundary	30.1%	35.5%	0.0%	-	-	34.4%	1,968	69.7%
2024	PC gain from Con	Llinos Medi	23.4%	30.5%	1.3%	9.9% Ref	1.9%	0.6%	637	61.4%

Earlier years are on pre-2024 boundaries; comparable results on the new boundary will be added when sourced.

Constituencies most like Ynys Mon

Five seats with similar demographic profiles to Ynys Mon. Politics shown for context.

What would change this seat?

Move the sliders to set national vote shares. The per-seat projection updates live. Reset returns to the current 7-poll average.

Sources

2024 general election results · UK Parliament Election Results portal and House of Commons Library briefing CBP-10009.
Notional 2019 results on 2024 boundaries · UK Parliament Election Results portal. Recalculated by Parliament; carries assumptions about how 2019 voters would have distributed across the redrawn boundaries.
Historic general election results (2010-2017) · House of Commons Library historic results files (on the boundaries in force at the time).
Ward-level GE2024 estimates · Britain Elects / New Statesman - article by Ben Walker, underlying spreadsheet. Modelled from constituency totals; average ~4pp per-ward MoE.
May 2026 council ward results · Democracy Club via PollCheck's locals 2026 dataset.
Earlier council ward results (2014-2024) · DCLEAPIL v1.0 (Jason Leman, drawing on Andrew Teale's LEAP dataset and Democracy Club).
Demographics · ONS Census 2021 (England and Wales), aggregated to constituency level using the ONS LSOA21 -> PCON24 best-fit lookup.
EU referendum 2016 estimates · Constituency-level Leave vote estimates (Hanretty 2017 method).
MP details and Cabinet roles · UK Parliament Members API. MP photos are fetched live from the same source.
Boundary geometry and lookups · ONS Open Geography Portal (PCON24 boundaries, LSOA21 boundaries, LSOA21-WD24-LAD24 best-fit lookup).
Current projection and trajectory · PollCheck's demographic swingometer applied to the rolling 7-poll average from aggregated GB polls. Not a true MRP - vote-share movements are applied through per-constituency sensitivity multipliers derived from demographic regressions.

If you spot a data issue, please let us know.