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Peräseinäjoki is a municipality of Finland.
It is located in the province of Western Finland and is part of the Southern Ostrobothnia region. The municipality has a population of 3,653 (2003) and covers an area of 459.13 km² of which 14.11 km² is water. The population density is 8.2 inhabitants per km². Since the 1st of January, 2005 Peräseinäjoki is a part of Seinäjoki.
The municipality is unilingually Finnish.