Mid and West Wales is an unofficial subdivision of Wales

Wales

Wales is a country that is part of the United Kingdom and the island of Great Britain, bordered by England to its east and the Atlantic Ocean and Irish Sea to its west. It has a population of three million, and a total area of 20,779 km²...

 that is sometimes used, consisting broadly of the preserved counties

Preserved counties of Wales

The preserved counties of Wales are the current areas used in Wales for the ceremonial purposes of Lieutenancy and Shrievalty. They are based on the counties created by the Local Government Act 1972 and used for local government and other purposes between 1974 and 1996.-Usage:The Local Government ...

 of Dyfed

Dyfed

Dyfed is a preserved county of Wales. It was created on 1 April 1974 under the terms of the Local Government Act 1972, and covered approximately the same geographic extent as the ancient Principality of Deheubarth, although excluding the Gower Peninsula and the area west of the River Tawe...

 and Powys

Powys

Powys is a local-government county and preserved county in Wales.-Geography:Powys covers the historic counties of Montgomeryshire and Radnorshire, most of Brecknockshire , and a small part of Denbighshire — an area of 5,179 km², making it the largest county in Wales by land area.It is...

, sometimes Swansea

Swansea

Swansea is a coastal city and county in Wales. Swansea is in the historic county boundaries of Glamorgan. Situated on the sandy South West Wales coast, the county area includes the Gower Peninsula and the Lliw uplands...

 and sometimes parts of Gwynedd

Gwynedd

Gwynedd is a county in north-west Wales, named after the old Kingdom of Gwynedd. Although the second biggest in terms of geographical area, it is also one of the most sparsely populated...

.

There is a Mid and West Wales Fire and Rescue Service

Mid and West Wales Fire and Rescue Service

The Mid and West Wales Fire and Rescue Service is the fire and rescue service covering the Welsh principal areas of Carmarthenshire, Ceredigion, Neath Port Talbot, Pembrokeshire, Powys and Swansea....

 and a Dyfed-Powys Police

Dyfed-Powys Police

Dyfed-Powys Police is the territorial police force responsible for policing Ceredigion, Carmarthenshire, Pembrokeshire and the county of Powys, in Wales. The territory it covers is the largest police area in England and Wales, and the fourth largest in the United Kingdom...

 service.

There is also an electoral region for the National Assembly for Wales

National Assembly for Wales

The National Assembly for Wales is a devolved assembly with power to make legislation in Wales. The Assembly comprises 60 members, who are known as Assembly Members, or AMs...

 with the same name (which is used, in parallel with the smaller constituencies, to elect top-up members under the Additional Member System

Additional Member System

The Additional Member System is the term used in the United Kingdom for the mixed member proportional representation voting system used in Scotland, Wales and the London Assembly....

). A European Parliament constituency

Mid and West Wales (European Parliament constituency)

Mid and West Wales was a European Parliament constituency covering south western Wales.Prior to its uniform adoption of proportional representation in 1999, the United Kingdom used first-past-the-post for the European elections in England, Scotland and Wales...

existed from 1979 until 1994.