Kris Lloyd had held the seat for Labour at a by-election following the death of the previous councilor.
A by-election was held in Bryncoch South on 23 November 2017 following the death of Plaid Cymru councillor, Janice Dudley.
A by-election was held in Gwynfi on 16 August 2018 following the resignation of Labour Councillor, Ralph Thomas, after a secondary school was closed by the Council A by-election was held in Resolven on 23 May 2019 following the death of Labour Councillor, Des Davies, a member of the Council since its formation in 1995.
A by-election was held in Pelenna on 20 June 2019 following the death of Independent Councillor, Martin Ellis.
[3] A by-election was held in Aberavon on 6 May 2021 following the death of Labour Councillor, Steffan ap Dafydd.