It is located in the province of Western Finland and is part of the Southern Ostrobothnia region. The municipality had a population of 1,850 (2006) and covered an area of 291.32 km² of which 18.88 km² is water. The population density was 7.2 inhabitants per km².
The municipality was unilingually Finnish.
Media related to Lehtimäki at Wikimedia Commons
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