The Brecon East ward covers the town centre of Brecon, the residential areas stretching east to the junction with the A470 and the rural area around Slwch Farm.

[4] According to the 2011 UK Census the population of the St Mary ward was 3,111.

[7] At the May 2017 Powys County Council elections the St Mary ward was won from the Liberal Democrats by Sarah Lewis of the Conservatives.

[8] However Cllr Lewis resigned in October 2019, in the resulting by-election the seat was won by Labour Party candidate Liz Rijnenberg.

[10] He subsequently retained his seat unopposed at the 2004 election and won the contests in 2008 and 2012.