Under the 2023 review, the constituency was defined as being composed of the following, as they existed on 1 December 2020: • The
County Borough of Bridgend wards of:
Caerau,
Cornelly,
Llangynwyd,
Maesteg East, Maesteg West, and
Pyle. • The
County Borough of Neath Port Talbot wards of:
Aberavon,
Baglan,
Briton Ferry East,
Briton Ferry West,
Bryn and Cwmavon,
Cymmer,
Glyncorrwg,
Gwynfi,
Margam,
Pelenna,
Port Talbot,
Sandfields East,
Sandfields West, and
Tai-bach. Following local government boundary reviews which came into effect in May 2022, the constituency now comprises the following from the 2024 general election: • The County Borough of Bridgend wards of: Caerau, Cornelly, Llangynwyd, Maesteg East, Maesteg West, and Pyle, Kenfig Hill and Cefn Cribwr (part). • The County Borough of Neath Port Talbot wards of: Aberavon, Baglan, Briton Ferry East, Briton Ferry West, Bryn and Cwmavon, Cimla and Pelenna (part), Cymmer and Glyncorrwg, Gwynfi and Croeserw, Margam and Tai-bach, Port Talbot, Sandfields East, and Sandfields West. By population, it is made up as follows: • 61.1% from
Aberavon, accounting for 81.1% of the former constituency (parts in Neath Port Talbot CB, except Pelenna). • 21.6% from
Ogmore, accounting for 25.8% of the former constituency (Maesteg). • 16.0% from
Bridgend, accounting for 17.0% of that constituency under its 2010–2024 boundaries (Cornelly and Pyle). • 1.3% from
Neath, accounting for 1.7% of the former constituency (Pelenna). ==Elections==