Prepoll voting opened on Monday, when more than 540 people filled in their ballot papers ahead of the March 23 poll.

That number rose to more than 640 on Tuesday and 650 on Wednesday, despite an Electoral Commission computer glitch that slowed down the process of marking people off the electoral roll.

Outside the temporary electoral office in Fitzmaurice Street, candidates and their volunteers are handing out how-to-vote cards and speaking to the early bird voters.

Despite their political differences, there is a clear camaraderie between the candidates. Four of them - The Greens' Ray Goodlass, Country Labor's Dan Hayes, Shooters, Fishers and Farmers' Seb McDonagh and the now-MP for Wagga, independent Joe McGirr - contested the byelection on September 9.

Mr Goodlass even regularly shares a stash of chocolates - stored in an insulated cup to escape the heat - with his fellow would-be MPs.

He said he particularly enjoyed campaigning outside the prepolling location, because it gave him a chance to really engage with voters, who often took the time to share their thoughts.

As you might imagine, the thoughts being shared with a Greens candidate include concerns about climate change and public services such as schools and education.

Mr Goodlass said he has also been able to engage voters on The Greens' preferencing in this election and explain why the allocations had been decided.

Mr Hayes is standing in his third state election and says he is seeing a little election fatigue, as this poll comes just six months after the Wagga byelection.

"There is a feeling 'we just did this'," he said.

Mr Hayes said some voters gave the definite impression that they had already made up their minds, while other were happy to take how-to-vote cards and chat.

"During the byelection, it was just about Wagga, but now it's about the whole state," he said.

"A lot more people are talking about statewide issues."

Mr McDonagh said the issues raised by voters were widespread, from police and crime to health and agriculture.

"There's been a good cross-section," he said.

The Nationals' Mackenna Powell, who is the only woman among the seven candidates, has also found a lot of voters raising broader state issues with her, but said others have had concerns that focused much more on Wagga, even down to some concerns about programs available at individual schools.

"Crime has been a big one, and country roads," she said.

In the lead-up to the Wagga byelection, almost a third of the electorate's 55,000 eligible voters cast their vote before election day.