Tarvasjoki 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 1,941 (2004-12-31) and covers an area of 102.51 km² of which 0.35 km² is water. The population density is 19.00 inhabitants per km².
The municipality is unilingually Finnish.
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