Between 19 October 2005 and 30 September 2009, the Parliament of Norway consisted of 169 members from 7 parties and 19 constituencies, elected during the Norwegian parliamentary election, 2005 on 11 and 12 September. The Red-Green Coalition, consisting of the Labour Party (61 members), the Socialist Left Party (15 members) and the Centre Party (11 members) gained a majority and created Stoltenberg's Second Cabinet. The majority cabinet lasted the entire session and was reelected in the 2009 election. The opposition consisted of four parties: the Progress Party (38 members), the Conservative Party (23 members), the Christian Democratic Party (11 members) and the Liberal Party (10 members).
Members of the Parliament of Norway are elected based on party-list proportional representation in plural member constituencies. This means that representatives from different political parties are elected from 19 constituencies, which are identical to the 19 counties. The electorate does not vote for individuals but rather for party lists, with a ranked list of candidates nominated by the party. This means that the person on top of the list will get the seat unless the voter alters the ballot. Parties may nominate candidates from outside their own constituency, and even Norwegian citizens currently living abroad.