Onsøy is a peninsula and a former municipality in Østfold county, Norway. The administrative centre was Gressvik.
The parish of Onsø was established as a municipality January 1, 1838 (see formannskapsdistrikt). A part of Onsøy with 170 inhabitants was moved to the neighboring municipality Fredrikstad on 1 January 1968.
On 1 January 1994 the rest of Onsøy was incorporated into Fredrikstad. Prior to the merger Onsøy had a population of 12.923.
The name
The Old Norse form of the name was Óðinsøy. The first element is the genitive case of the name of the god Odin, the last element is øy f 'island'. (The former island was later turned into a peninsula because of post-glacial rebound.)
References
- Dag Jukvam / Statistics Norway (1999). Historisk oversikt over endringer i kommune- og fylkesinndelingen. http://www.ssb.no/emner/00/90/rapp_9913/rapp_9913.pdfl.
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