Nominations for the by-election in Hengoed near Llanelli closed yesterday, with polling day set for 19 February.
The Plaid candidate for the County Council seat is Martin Davies, while Susan Phillips is standing for Llanelli Rural Council.
Carmarthenshire County Council has not yet announced the list of all those contesting the two seats, but it is understood that Labour is fielding Penny Edwards for the County Council and Tonia Antoniazzi for Llanelli Rural. Representing People First (Siân Caiach's group) is Wynford Samuel, nephew of George Edwards who narrowly took the seat for Labour in 2012.
It is not yet known whether Ukip, the Tories or the LibDems will be fielding candidates.
Martin has lived in Sandy for over 20 years and has represented Hengoed ward on Llanelli Rural Council since 2008. Martin represents the Rural Council on various outside bodies and is currently the Vice-Chairman of the Rural Council and will be invested as its Chairman in May 2015.
Martin is also a lecturer in Welsh at Trinity University and governor at Strade and Furnace Primary schools. Martin has also been a member of the successful Colliers quiz team for many years.
Born and bred in the ward, Susan was Post Mistress at Pwll Post Office for 15 years. Susan is also a voluntary music assistant at Pwll Primary School, organist at Bethlehem Baptist Chapel and a member of the Tŷ Bryngwyn Hospice Committee.