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Köyliö (Kjulo in Swedish) is a municipality of Finland.
It is located in the province of Western Finland and is part of the Satakunta region. The municipality has a population of 2,953 (2003) and covers an area of 259.36 km² of which 13.11 km² is water. The population density is 11.2 inhabitants per km².
The municipality is unilingually Finnish.