By-Election Location
By winning party colour
Voting Breakdown
Percentage based
Gains and Losses
Percentage based
Plaid Cymru 358 [75.8%; +18.6%]
Labour 114 [24.2%; +24.2%]
[Independent [0.0%; -42.8%]
Majority: 244
Plaid Cymru hold
Percentage change since 2012