It is located in the province of Western Finland and is part of the Satakunta region. The municipality had a population of 3,408 (2003) and covered an area of 149.88 km² of which 0.22 km² is water. The population density was 22.7 inhabitants per km².
In Kiukainen there are many ancient gravehills made from piled stones. Biggest of them is called kuninkaanhauta, "the king's grave". It is the biggest of its type in Nordic Countries.
The municipality was unilingually Finnish.
Before the 2009 consolidation, Kiukainen was twinned with:
Media related to Kiukainen at Wikimedia Commons
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