CHELTENHAM:
* More than 26,000 people are eligible to vote in Cheltenham.
* The seat covers just over 17 square kilometres in Adelaide's northwest.
* It was created in the 1998 redistribution of state electoral boundaries and has been held since 2002 by former premier Jay Weatherill.
* In the 2018 state election, Mr Weatherill won with 65.9 per cent of the two-party preferred vote.
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* Five candidates will contest the by-election. Peter Miller for the Liberal Democrats, Joe Szakacs for Labor, Steffi Medrow for The Greens and independents Mike Lesiw and Rob De Jonge.
* SA Unions boss Joe Szakacs is strongly tipped to win with the Liberal government choosing not to field a candidate.
Source: SA Electoral Commission
