Akershus () is a traditional region, former and future county, and current electoral district in Norway, with Oslo as its main city and traditional capital. It is named after the Akershus Fortress in Oslo. From the middle ages to 1919, Akershus was a fief and main county that included most of Eastern Norway, and from the 17th century until 2020, Akershus also had a more narrow meaning as a (sub) county that included most of the Greater Oslo Region. After 2020 the former county of Akershus was merged into Viken along with the former counties of Østfold and Buskerud. In 2022 the Storting voted to dissolve Viken and reestablish Akershus county.
Originally Akershus was one of four main fiefs in Norway and included almost all of Eastern Norway. The original Akershus became a main county (Stiftamt or Stift) in 1662 and was sometimes also known as Christiania Stift. It included several subcounties (Amt or Underamt); in 1682 its most central areas, consisting of modern Oslo and Akershus, became the subcounty of Akershus within the larger main county of the same name. In 1842 the capital city of Christiania, which at the time consisted of a tiny part of modern Oslo, became a separate subcounty within Akershus main county. The main county of Akershus was disestablished in 1919, and the subcounty continued as Akershus county (fylke). During its history Akershus (sub) county ceded territory to Oslo several times; Akershus' most central and important municipality, Aker, was transferred to Oslo in 1948.
The remaining county of Akershus after 1948 borders Hedmark, Oppland, Buskerud, Oslo, and Østfold; it also has a short border with Sweden (Värmland). Akershus, with a little over 614,000 inhabitants, is the second most populated county by population after Oslo. The county administration is in central Oslo, which is not part of the modern county per se.
Geography
As a geographical term the meaning of Akershus has changed over time. Akershus originally primarily referred to Akershus main county, which included most of Eastern Norway, with the exception of Upper Telemark and Båhuslen (now mainly part of Sweden). The modern Akershus county is a direct continuation of the subcounty of Akershus, created in 1682, and included all of modern Oslo and Akershus. In 1842 the capital city of Christiania, which at the time consisted of a tiny part of modern Oslo, became a separate subcounty within Akershus main county. Akershus main county ceased to exist in 1919, after which Akershus in everyday usage became synonymous with the modern county that excluded Christiania. Akershus' most central and important municipality, Aker, was transferred to and merged with Oslo in 1948.
After 1948, the remaining Akershus county is conventionally divided into Asker and Bærum to the west of Oslo, Follo and Romerike.
Embracing numerous suburbs and urban areas of Oslo, notably Bærum and historically Aker, Akershus is one of the most densely populated areas in the country. The main national railway lines into Oslo run through Akershus with many junctions and stations such as Asker, Sandvika, Ski, and Lillestrøm. Akershus includes some of the lake Mjøsa and some of the river Glomma.
The county also includes the historical place Eidsvoll, 48 km north of Oslo, in which the national assembly ratified the Norwegian constitution in 1814. South of Eidsvoll is the international airport, Oslo Airport at Gardermoen. Oslo's previous international airport, Fornebu, is also located in Akershus. The estate of the crown prince is located in Asker (the royal palace is in Oslo).
Mountains in Akershus
Infrastructure
The county has two major hospitals, Akershus University Hospital and Sykehuset Asker og Bærum.
The main road from continental Europe, E6, enters Akershus in the south, and runs through eastern Oslo, further to Gardermoen, and into Hedmark County on the eastern shores of lake Mjøsa.
E18 enters Akershus in the south-east, merges for a short stretch with E6 at Vinterbro in Ås, before running under central Oslo. E18 then turns south-west through Bærum and Asker before entering Buskerud County north of Drammen.
E16 runs from the intersection with E18 in Sandvika into Buskerud County west of Sollihøgda.
All main railways out of Oslo run through Akershus: