There are five constitencies covering Dyfed. They are all county constituencies (CCs) of the House of Commons of the Parliament of the United Kingdom (Westminster), and are used also for elections to the National Assembly for Wales. The current boundaries have been effective since the Welsh Assembly election, 2007 and the 2010 United Kingdom general election.
Dyfed is one of the eight preserved counties of Wales, consisting of the principal areas of Pembrokeshire, Carmarthenshire and Ceredigion. These principal areas are also known as counties.
For Welsh Assembly elections, constituencies are grouped into additional member electoral regions.
Westminster boundaries 
From 2010 
1997 to 2010 
Proposed changes - 2011 
As part of the Sixth Periodic Review of Westminster constituencies which commenced in 2011, the Boundary Commission for Wales has proposed creating new constituencies form Dyfed, with electoral wards taken from Pembrokeshire, Carmarthenshire and Ceredigion.
- Ceredigion and North Pembrokeshire
- South Pembrokeshire
- 1 "Llanelli" contains electoral wards from Swansea in addition to Carmarthenshire.
Assembly boundaries 
From 2007 
The Mid and West Wales region also includes two Powys constituencies and one Gwynedd constituency.
1999 to 2007 
Notes and references 
- ^ The Parliamentary Constituencies and Assembly Electoral Regions (Wales) Order 2006, OPSI website
- ^ Revised proposals Boundary Commission for Wales