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Perniö (Bjärnå in Swedish) is a municipality of Finland.
It is located in the province of Western Finland and is part of the Finland Proper region. The municipality has a population of 6,023 (2003) and covers an area of 407.79 km² of which 9.91 km² is water. The population density is 15.1 inhabitants per km².
The municipality is unilingually Finnish.Template:Finland-geo-stub