It is located in the province of Western Finland and is part of the Central Finland region. The municipality had a population of 1,293 (2003) and covered an area of 307.93 km² of which 77.34 km² is water. The population density was 5.6 inhabitants per km².
People born in Sumiainen
- Kotimaisten kielten tutkimuskeskus :: Kuntien nimet Archived 2011-12-23 at the Wayback Machine.
Media related to Sumiainen at Wikimedia Commons
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