The electoral ward of St. Thomas consists of the following areas: Dan-y-graig, Port Tennant, St. Thomas, Kilvey Hill and the Grenfell Park Area, in the parliamentary constituency of Swansea East.

The River Tawe forms part of the border between St. Thomas and the Castle ward.

The suburb of St. Thomas is a residential area located immediately east of Swansea city centre.

Port Tennant and Grenfell Park, further east of St. Thomas are small council estates comprising fairly run down housing stock.

Swansea's Fabian Way Park and Ride facility is located to the far east of the ward.