Mount Roskill is located on the western side of the Auckland isthmus, bordering the Manukau Harbour.

It is anchored around the suburbs of Mount Roskill, Three Kings, Hillsborough and a large section of Balmoral.

The 2008 election boundaries added in Lynfield and New Windsor at the expense of Onehunga, which returned to the Maungakiekie electorate after being cut out in 1999.

The 1996 New Zealand census showed population growth in the north and west of Auckland, necessitating the redistribution of electorates for the 1999 election.

The existing New Lynn seat was renamed Titirangi, with its boundaries shifted to fall in between Auckland and Waitakere cities.

The eastern side of the New Lynn residential area was amalgamated with the population excess of Epsom, the southern half of Owairaka seat (which was itself renamed Mount Albert) and the western end of Maungakiekie to form a new seat.

Named Mount Roskill, it was the first new seat drawn since the introduction of Mixed Member Proportional voting three years previous.

[citation needed] At the 2020 redistribution it gained New Windsor from New Lynn at the expense of Royal Oak, which moved to Maungakiekie.

After Goff was elected Mayor of Auckland in October 2016, a by-election date was set for 3 December 2016.

[citation needed] Carlos Cheung won the seat for the first time for the National Party in the 2023 New Zealand general election, defeating former Minister and incumbent MP Michael Wood with a 22-point swing.

Key United Future   National   Green   NZ First 1Wang was elected from the party list in November 2004 following the expulsion of Donna Awatere Huata.

Pink background denotes a candidate elected from their party list prior to the by-election.