Chesham and Amersham
South East · County constituency · Buckinghamshire
About the Chesham and Amersham constituency
Chesham and Amersham is a county constituency in the South East. The sitting MP is Sarah Green (Liberal Democrat), MP since June 2021. At the 2024 general election, the Liberal Democrats won with 44.9% to 34.8% for the Conservatives, a majority of 5,451 votes on a 72.7% turnout. PollCheck's current projection, at the seven-poll average, has the Liberal Democrats on 43.0% and the Conservatives on 39.9%, a margin of 3.1 points.
Who lives in Chesham and Amersham? Constituency demographics
From the 2021 Census and 2016 EU referendum estimates. Constituency-level data on 2024 boundaries.
How did Chesham and Amersham 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
Current projection
Map of Chesham and Amersham
Switch between GE2024 ward winners (modelled estimates, ~4pp average error) and a demographic view from the 2021 Census. Hover any area for detail. How the map is built ›
Chesham and Amersham within Buckinghamshire
Chesham and Amersham sits entirely within Buckinghamshire Council. Buckinghamshire was not due to vote in 2026, so the figures below are the most recent ward results with vote counts available. About this layer ›
Council overlap
| Council | Share of seat |
|---|---|
| Buckinghamshire | 100% |
Most recent council ward results
Latest council winner per ward - May 2026 results where the council voted, otherwise the most recent result with vote counts available. How this table is sourced ›
| Ward | GE2024 winner | Latest council winner | Shift since GE2024 | Turnout |
|---|---|---|---|---|
| Amersham and Chesham Bois | Lib Dem 50.9%vs Conservative 30.8% | 2025 Lib Dem 48.6%vs Conservative 34.0%2025 ward: Amersham & Chesham Bois, covering 100% of this ward | - | 45.1% |
| Chalfont St Giles | Lib Dem 42.2%vs Conservative 37.6% | 2025 Conservative 44.6%vs Lib Dem 38.2%2025 ward: Chalfont St Giles & Little Chalfont, covering 80% of this ward | - | 41.7% |
| Chalfont St Peter | Lib Dem 43.3%vs Conservative 37.8% | 2025 Conservative 29.9%vs Independent 26.0%2025 ward: Chalfont St Peter, covering 100% of this ward | - | 40.3% |
| Chesham | Lib Dem 44.9%vs Conservative 31.2% | 2025 Lib Dem 51.0%vs Conservative 27.8%2025 ward: Chesham North, covering 100% of this ward | - | 41.5% |
| Chess Valley | Lib Dem 46.0%vs Conservative 32.8% | 2025 Lib Dem 49.1%vs Conservative 27.2%2025 ward: Chesham South, covering 86% of this ward | - | 41.8% |
| Chiltern Ridges | Lib Dem 46.8%vs Conservative 31.8% | 2025 Lib Dem 51.0%vs Conservative 27.8%2025 ward: Chesham North, covering 33% of this ward | - | 41.5% |
| Denham | Conservative 37.9%vs Lib Dem 29.8% | 2025 Conservative 41.5%vs Reform 25.6%2025 ward: Gerrards Cross & Denham, covering 100% of this ward | - | 33.3% |
| Gerrards Cross | Lib Dem 38.6%vs Conservative 37.4% | 2025 Conservative 41.5%vs Reform 25.6%2025 ward: Gerrards Cross & Denham, covering 80% of this ward | - | 33.3% |
| Hazlemere | Conservative 38.2%vs Lib Dem 38.1% | 2025 Conservative 31.6%vs Independent 26.3% | - | 36.3% |
| Little Chalfont and Amersham Common | Lib Dem 45.8%vs Conservative 34.3% | 2025 Lib Dem 48.6%vs Conservative 34.0%2025 ward: Amersham & Chesham Bois, covering 50% of this ward | - | 45.1% |
| Penn Wood and Old Amersham | Lib Dem 43.4%vs Conservative 37.3% | 2025 Lib Dem 41.4%vs Conservative 30.8%2025 ward: Penn, Tylers Green & Loudwater, covering 38% of this ward | - | 36.4% |
Projection trajectory
PollCheck's projection for Chesham and Amersham at each of the last 60 GB polls. Hover the chart for the underlying poll details.
Who has won Chesham and Amersham at past elections?
2024 and notional 2019 rows are on current boundaries; 2010-2017 rows are on the boundaries in force at the time. More on boundaries ›
| Year | Result | MP | Lab | Con | LD | Majority | Turnout |
|---|---|---|---|---|---|---|---|
| 2010 | Con hold | Cheryl Gillan | 5.6% | 60.4% | 28.5% | 16,710 | 74.6% |
| 2015 | Con hold | Cheryl Gillan | 12.7% | 59.1% | 9.0% | 23,920 | 72.7%-1.9 |
| 2017 | Con hold | Cheryl Gillan | 20.6% | 60.7% | 13.0% | 22,140 | 77.1%+4.4 |
| 2019notional | Conservative winner | Cheryl Gillan 2019 MP, pre-review boundary | 13.9% | 56.3% | 22.4% | 18,216 | 72.4%-4.7 |
| 2021by-election | LD gain from Con | Sarah Green | 1.6% | 35.5% | 56.7% | 8,028 | 52.1% |
| 2024 | LD gain from Con | Sarah Green | 6.4% | 34.8% | 44.8% | 5,451 | 72.7%+0.3 |
Earlier years are on pre-2024 boundaries; comparable results on the new boundary will be added when sourced. By-elections are on the boundaries in force at the time and usually have much lower turnout than a general election.
Constituencies most like Chesham and Amersham
Five seats with similar demographic profiles to Chesham and Amersham. Politics shown for context.
- ↑Graduate47.3 / 48.7vs 33.7
- ↑Owner-occupied74.7 / 74.3vs 61.9
- ↓Leave45.0 / 38.6vs 53.2
- ↑Owner-occupied74.7 / 73.0vs 61.9
- ↑Graduate47.3 / 44.6vs 33.7
- ↓No quals11.8 / 12.6vs 18.0
- ↑Owner-occupied74.7 / 71.2vs 61.9
- ↑Graduate47.3 / 42.6vs 33.7
- ↓Under 3523.2 / 23.8vs 30.2
- ↑Graduate47.3 / 47.8vs 33.7
- ↑Owner-occupied74.7 / 75.5vs 61.9
- ↓Leave45.0 / 42.7vs 53.2
- ↑Owner-occupied74.7 / 71.2vs 61.9
- ↑Graduate47.3 / 42.6vs 33.7
- ↓Leave45.0 / 46.2vs 53.2
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.
Related
Sources
Every figure on this page is computed from the sources below. Read the full methodology ›
Show full source list
- 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 model at the rolling 7-poll average from aggregated GB polls, built from the British Election Study Internet Panel (Fieldhouse et al.), Census 2021 (ONS) and Scotland's Census 2022 (NRS). The trajectory was recalculated with the current model, introduced in autumn 2026.
If you spot a data issue, please let us know.