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Isokyrö (Storkyro in Swedish) is a municipality of Finland.
It is located in the province of Western Finland and is part of the Ostrobothnia region. The municipality has a population of 5,065 (2003) and covers an area of 357.63 km² of which 2.92 km² is water. The population density is 14.2 inhabitants per km².
The municipality is unilingually Finnish.