The constituency was established as Kristiania in 1921 following the introduction of proportional representation for elections to the Storting.
The constituency currently elects 19 of the 169 members of the Storting using the open party-list proportional representation electoral system.
Oslo currently elects 19 of the 169 members of the Storting using the open[a] party-list proportional representation electoral system.
[8][9] Constituency seats are allocated by the County Electoral Committee using the Modified Sainte-Laguë method.
Results of the 2021 parliamentary election held on 13 September 2021:[14] The following candidates were elected:[15] Grunde Almeland (V); Nikolai Astrup (H); Seher Aydar (R); Lan Marie Berg (MDG); Espen Barth Eide (Ap); Ola Elvestuen (V); Kamzy Gunaratnam (Ap); Rasmus Hansson (MDG); Marian Abdi Hussein (SV); Kari Elisabeth Kaski (SV); Mudassar Kapur (H); Heidi Nordby Lunde (H); Guri Melby (V); Bjørnar Moxnes (R); Ine Eriksen Søreide (H); Jonas Gahr Støre (Ap); Trine Lise Sundnes (Ap); Christian Tybring-Gjedde (FrP); Mathilde Tybring-Gjedde (H); and Andreas Sjalg Unneland (SV).
Results of the 2017 parliamentary election held on 11 September 2017:[16] The following candidates were elected:[17] Nikolai Astrup (H); Une Aina Bastholm (MDG); Jan Bøhler (Ap); Espen Barth Eide (Ap); Petter Eide (SV); Ola Elvestuen (V); Trine Skei Grande (V); Stefan Heggelund (H); Siv Jensen (FrP); Mudassar Kapur (H); Kari Elisabeth Kaski (SV); Heidi Nordby Lunde (H); Marianne Marthinsen (Ap); Bjørnar Moxnes (R); Siri Staalesen (Ap); Ine Eriksen Søreide (H); Jonas Gahr Støre (Ap); Michael Tetzschner (H); and Christian Tybring-Gjedde (FrP).
Results of the 2001 parliamentary election held on 9 and 10 September 2001:[25][26] The following candidates were elected:[27] Kristin Krohn Devold (H); Odd Einar Dørum (V); Per-Kristian Foss (H); Bjørgulv Froyn (Ap); Carl I. Hagen (FrP); Kristin Halvorsen (SV); Britt Hildeng (Ap); Heikki Holmås (SV); Siv Jensen (FrP); Heidi Larssen (H); Inge Lønning (H); Marit Nybakk (Ap); Afshan Rafiq (H); Lars Rise (KrF); Heidi Sørensen (SV); and Jens Stoltenberg (Ap).
[42] The KrF-Sp-DLF list alliance's seat was allocated to the Christian Democratic Party.