The board had some specific interests in Kai Iwi, including a cycle track to Mowhanau Beach and improvements to William Birch Park.
Whanganui District Council chief executive David Langford encouraged those in the area to vote.
“Representative rural leadership in the Whanganui District relies on engagement from our rural community and, as a council, we need to hear about the issues and concerns of our rural residents in order to best serve them,” he said.
The byelection was an opportunity for residents to have their preferred candidate bring those issues to the council.
Voting papers will be mailed to electors on June 15, with voting to close at midday on July 7.
Special voting facilities for the byelection will be available at the council buildings at 101 Guyton St during normal office hours while voting is open.