The resignation of an area councillor resulted in a casual vacancy for this position.

Section 6A of the Local Government (Elections) Act 1999 was applied to fill this vacancy. This section describes how casual vacancies must be filled in certain circumstances, including where the vacancy occurs within 12 months after the conclusion of a supplementary election. Unsuccessful candidates from a previous supplementary election are contacted, and a recount of the votes is conducted including those candidates who have confirmed that they are still willing and have been found to still be eligible to nominate for the position.

In the supplementary election for area councillor for the District Council of Tumby Bay that concluded 5 May 2025, there was only 1 unsuccessful candidate. They were confirmed as still willing and eligible to nominate for the position. As only 1 candidate was willing and eligible to be elected to this vacancy, Robert RANDALL has been declared elected.