The electorate was formed in
1996 for the
mixed-member proportional (MMP) voting system by combining the former
Tasman and
West Coast electorates.
Damien O'Connor was the first representative and he held the electorate until the
2008 general election, when he was beaten by
National candidate
Chris Auchinvole, who had previously been a list MP. Auchinvole's majority was 971. His position on the Labour Party list meant that O'Connor couldn't return to Parliament immediately. When the list MP
Michael Cullen retired in May 2009, O'Connor regained his position as Member of the House of Representatives because he was the highest-ranked candidate on the list not already an MP. In contrast to the overall trend, he regained the electorate in the . Auchinvole retired from politics at the end of the 2011–2014 parliamentary term, and former Mayor of
Westland District,
Maureen Pugh, gained the nomination for the National Party. O'Connor was once again successful. Based on preliminary results for the , Pugh was the lowest-ranked National Party list member who was returned to Parliament, but when the final results were released two weeks later, National had lost one list seat and Pugh did not get returned to Parliament.
Members of Parliament West Coast-Tasman has been represented by two electorate MPs so far:
Key List MPs Members of Parliament elected from party lists in elections where that person also unsuccessfully contested the West Coast-Tasman electorate. Unless otherwise stated, all MPs terms began and ended at general elections. 1In the Damien O'Connor's list position of 37 meant he was not returned until
Michael Cullen resigned in May 2009. 2Kevin Hague resigned from Parliament on 7 October 2016. 3Maureen Pugh's list position of 52 meant she became elected after
Tim Groser resigned in December 2015. She assumed office in early 2016 and was not returned to Parliament at the 2017 election, until the resignation of
Bill English. 4Maureen Pugh's list position of 44 meant she became elected after
Bill English resigned in February 2018. She assumed office in early 2018. ==Election results==