List of marginal seats before the 2017 United Kingdom general election

The 2017 general election was called by Prime Minister Theresa May on 18 April that year, and held 51 days later on 8 June.^[1] 'Election Polling' marked the following as each of the parties' key target seats, ones that were held by a low margin and could feasibly be won by a different party than in the 2015 election

List by party

Conservative

Conservative target seats^[2]
Rank	Constituency	Winning party 2015		Swing required	Winning party 2017
1	City of Chester		Labour	0.09%		Labour
2	Ealing Central & Acton		Labour	0.27%		Labour
3	Berwickshire, Roxburgh and Selkirk		SNP	0.30%		Conservative
4	Brentford and Isleworth		Labour	0.41%		Labour
5	Halifax		Labour	0.49%		Labour
6	Wirral West		Labour	0.50%		Labour
7	Ilford North		Labour	0.60%		Labour
8	Newcastle-under-Lyme		Labour	0.76%		Labour
9	Barrow and Furness		Labour	0.92%		Labour
10	Wolverhampton South West		Labour	1.00%		Labour
11	Hampstead and Kilburn		Labour	1.05%		Labour
12	Enfield North		Labour	1.18%		Labour
13	Hove		Labour	1.18%		Labour
14	Dewsbury		Labour	1.35%		Labour
15	Southport		Liberal Democrats	1.50%		Conservative
16	Lancaster and Fleetwood		Labour	1.50%		Labour
17	Carshalton and Wallington		Liberal Democrats	1.52%		Liberal Democrats
18	North East Derbyshire		Labour	1.96%		Conservative
19	Richmond Park		Liberal Democrats^[a]	2.25%		Conservative
20	Harrow West		Labour	2.37%		Labour
21	Bridgend		Labour	2.44%		Labour
22	Middlesbrough South and Cleveland East		Labour	2.48%		Conservative
23	Westminster North		Labour	2.50%		Labour
24	Walsall North		Labour	2.63%		Conservative
25	Wrexham		Labour	2.80%		Labour
26	Birmingham Northfield		Labour	2.95%		Labour
27	Wakefield		Labour	3.04%		Labour

Labour

Labour target seats^[3]
Rank	Constituency	Winning party 2015		Swing required	Winning party 2017
1	Gower		Conservative	0.03%		Labour
2	Derby North		Conservative	0.05%		Labour
3	Croydon Central		Conservative	0.16%		Labour
4	Vale of Clwyd		Conservative	0.34%		Labour
5	Bury North		Conservative	0.42%		Labour
6	Morley and Outwood		Conservative	0.44%		Conservative
7	Thurrock		Conservative	0.54%		Conservative
8	Plymouth Sutton and Devonport		Conservative	0.55%		Labour
9	Brighton Kemptown		Conservative	0.76%		Labour
10	Bolton West		Conservative	0.82%		Conservative
11	Weaver Vale		Conservative	0.86%		Labour
12	Telford		Conservative	0.90%		Conservative
13	Bedford		Conservative	1.19%		Labour
14	Plymouth Moor View		Conservative	1.20%		Conservative
15	Lincoln		Conservative	1.54%		Labour
16	Peterborough		Conservative	2.04%		Labour
17	Cardiff North		Conservative	2.09%		Labour
18	Sheffield Hallam		Liberal Democrats	2.12%		Labour
19	Corby		Conservative	2.15%		Conservative
20	Waveney		Conservative	2.31%		Conservative
21	Warrington South		Conservative	2.32%		Labour
22	Southampton Itchen		Conservative	2.59%		Conservative
23	Keighley		Conservative	3.11%		Labour
24	Warwickshire North		Conservative	3.14%		Conservative
25	Carlisle		Conservative	3.26%		Conservative
26	Renfrewshire East		SNP	3.28%		Conservative
27	Leeds North West		Liberal Democrats	3.35%		Labour

Liberal Democrats

Liberal Democrat target seats^[4]
Rank	Constituency	Winning party 2015		Swing required	Winning party 2017
1	Cambridge		Labour	0.58%		Labour
2	Eastbourne		Conservative	0.69%		Liberal Democrats
3	Lewes		Conservative	1.07%		Conservative
4	Thornbury and Yate		Conservative	1.54%		Conservative
5	Twickenham		Conservative	1.63%		Liberal Democrats
6	East Dunbartonshire		SNP	1.97%		Liberal Democrats
7	Kingston and Surbiton		Conservative	2.39%		Liberal Democrats
8	St Ives		Conservative	2.56%		Conservative
9	Edinburgh West		SNP	2.93%		Liberal Democrats
10	Torbay		Conservative	3.42%		Conservative
11	Sutton and Cheam		Conservative	3.93%		Conservative
12	Bath		Conservative	4.06%		Liberal Democrats
13	Burnley		Labour	4.08%		Labour
14	Bermondsey and Old Southwark		Labour	4.36%		Labour
15	Yeovil		Conservative	4.67%		Conservative
16	North East Fife		SNP	4.80%		SNP
17	Caithness, Sutherland and Easter Ross		SNP	5.62%		Liberal Democrats
18	Colchester		Conservative	5.74%		Conservative
19	Cheltenham		Conservative	6.06%		Conservative
20	Cheadle		Conservative	6.08%		Conservative
21	Berwick-upon-Tweed		Conservative	6.08%		Conservative
22	Ross, Skye and Lochaber		SNP	6.13%		SNP
23	Portsmouth South		Conservative	6.25%		Labour
24	Brecon and Radnorshire		Conservative	6.37%		Conservative
25	Cardiff Central		Labour	6.37%		Labour
26	Devon North		Conservative	6.44%		Conservative
27	Wells		Conservative	6.66%		Conservative

SNP

SNP target seats
Rank	Constituency	Winning party 2015		Swing required	Winning party 2017
1	Dumfriesshire, Clydesdale and Tweeddale		Conservative	0.77%		Conservative
2	Orkney and Shetland		Liberal Democrats	1.80%		Liberal Democrats
3	Edinburgh South		Labour	2.68%		Labour

Green

Green Party target seats
Rank	Constituency	Winning party 2015		Swing required	Winning party 2017
1	Bristol West		Labour	4.4%		Labour

Plaid Cymru

Plaid Cymru target seats
Rank	Constituency	Winning party 2015		Swing required	Winning party 2017
1	Ynys Môn		Labour	0.35%		Labour

Sinn Féin

Sinn Féin target seats
Rank	Constituency	Winning party 2015		Swing required	Winning party 2017
1	Fermanagh and South Tyrone		UUP	0.52%		Sinn Féin

DUP

Sinn Féin target seats
Rank	Constituency	Winning party 2015		Swing required	Winning party 2017
1	Belfast South		SDLP	1.16%		DUP

Notes

^ Elected in the 2016 by-election

References

^ Asthana, Anushka; Mason, Rowena; Elgot, Jessica (18 April 2017). "Theresa May calls for UK general election on 8 June". The Guardian – via www.theguardian.com.
^ "CONSERVATIVE TARGET SEATS". ukpollingreport.co.uk. Retrieved 22 September 2013.
^ "Labour Targets". ukpollingreport.co.uk.
^ "LIBERAL DEMOCRAT TARGET SEATS". ukpollingreport.co.uk. Retrieved 22 September 2013.