Rainham South was a three-member ward which elected councillors for the first time in May 2003. , but is due to be abolished in May 2023 following a boundary review.
There have been five elections in Rainham South ward. In the last election in May 2019, the Conservatives received the highest number of votes and won all three seats.
Voters in the ward have only ever elected Conservative councillors.
The following councillors represented Rainham South ward between 2003 and 2023: