Onsøy

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Onsøy is a former municipality in Østfold county, Norway. The administrative centre was Gressvik.

It was created as Onsøy formannskapsdistrikt in 1837. 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.

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