It is one of seven constituencies in the South Wales West electoral region, which also elects four additional members, to produce a degree of proportional representation for the region as a whole.

It covers the area of Bridgend County Borough Council roughly north of the M4, and parts of Rhondda Cynon Taf County Borough Council.

It includes the communities of Cefn Cribwr, Garw Valley, Gilfach Goch, Llanharan, Maesteg, Ogwr Valley, Pencoed, Sarn and Tondu.

In general elections for the Senedd, each voter has two votes.

Want of an Official Mark (0), Voting for more than ONE party or individual candidate (58), Writing or mark by which the Voter could be identified (0), Unmarked or Void for uncertainty (96) Regional ballots rejected: 145[7] 2003 Electorate: 49,565 List ballots rejected: 303