Key numbers for Super Saturday

KEY NUMBERS IN BY-ELECTIONS

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* First time five by-elections have been held on the one day

* 48 candidates standing in five seats

* Highest number of candidates is 15 standing in Perth

* A government has not won a seat from an opposition in a by-election since 1920

* Ahead of the by-elections the House of Representatives comprises: 76 coalition, 65 Labor, 1 Greens, 1 Katter, 2 Independents, 5 vacancies (four Labor, one Independent).

* The Liberal Party is running in three of the five by-elections (Longman, Mayo and Braddon)

* Labor is contesting all five (including Perth and Fremantle).

* Number of voters in each seat: Longman (111,784), Mayo (107,672), Braddon (73,756), Fremantle (103,226), Perth (100,737).