Senate hopeful Greg Mirabella is facing questions from party members over his regional credentials amid revelations his family are living in inner Melbourne.

Mr Mirabella, a farmer from north-east Victoria, and former Liberal MP Sarah Henderson are considered front-runners in the preselection race to take Victoria’s empty Senate position following the appointment of former minister Mitch Fifield as Australia's next ambassador to the United Nations.

Greg Mirabella, husband of former Liberal MP Sophie, is a front-runner for a Victorian Senate vacancy. Credit:Matthew Smithwick/ Border Mail

Both have strongly pushed their regional credentials to the 500-odd party members who will decide the winner in a fortnight, following a raft of members airing concerns the party had become too city centric.

Mr Mirabella, a former Victorian Farmers Federation branch president, claims a primary residence at a farm near Wangaratta in his wife Sophie's former federal electorate of Indi.