It replaced the Hauraki electorate and absorbed a significant part of northern Te Tai Hauāuru.
The seat was held by Nanaia Mahuta of the Labour Party for the entirety of its existence from 2002 to 2008.
Key Labour No candidates that contested the Tainui electorate were returned as list MPs.
Yellow background denotes an electorate win by a list member, or other incumbent.
Yellow background denotes an electorate win by a list member, or other incumbent.