Aust-Agder (, ) was a county ( fylke) in Norway from 1 January 1919 to 31 December 2019, after it was merged with Vest-Agder to form Agder county. In 2002, there were 102,945 inhabitants, which was 2.2% of Norway's population. Its area was . The county's administrative center was the town of Arendal.
The county, located along the Skagerrak coast, extended from Gjernestangen at Risør to the Kvåsefjorden in Lillesand. The inner parts of the area included Setesdalsheiene and Austheiene. Most of the population lives near the coast; about 78% of the county's inhabitants live in the five coastal municipalities of Arendal, Grimstad, Lillesand, Tvedestrand, and Risør. The rest of the county is sparsely populated. Tourism is important, as Arendal and the other coastal towns are popular attractions.
The county includes the larger islands of Tromøya, Hisøya, Justøya, and Sandøya. The interior of the county encompasses the traditional district of Setesdal, through which the river Otra flows to the coast.
In 2017, the Parliament of Norway voted to merge Aust-Agder and Vest-Agder counties into one large region, Agder, effective 1 January 2020.
The county was part of the Aust-Agder District Court and the Church of Norway Diocese of Agder og Telemark.
Until 1919, the name of the county was Nedenes amt. The amt was named after the old Nedenes farm (Old Norse Niðarnes), since this was the seat of the amtmann (County Governor). The first element is the genitive case of the river name Nið (now called Nidelva) and the last element is nes which means "headland". The meaning of the river name is unknown.
0901 | Risør | Risør | ||
0904 | Grimstad | Grimstad | ||
0906 | Arendal | Arendal | ||
0911 | Gjerstad | Gjerstad | ||
0912 | Vegårshei | Myra | ||
0914 | Tvedestrand | Tvedestrand | ||
0919 | Froland | Blakstad | ||
0926 | Lillesand | Lillesand | ||
0928 | Birkenes | Birkeland | ||
0929 | Åmli | Åmli | ||
0935 | Iveland | Birketveit | ||
0937 | Evje og Hornnes | Evje | ||
0938 | Bygland | Bygland | ||
0940 | Valle | Valle | ||
0941 | Bykle | Bykle | ||
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