Ulvila (Swedish: Ulvsby) is a town and municipality of Finland. It is one of the six medieval cities of Finland, as well as the third oldest in the country. Its position as city was taken over by Pori in the 16th century. It is located in the province of Western Finland and is part of the Satakunta region. The municipality has a population of 12,842 (31 July 2020) and covers an area of 422.51 square kilometres (163.13 sq mi) of which 21.82 km2 (8.42 sq mi) is water. The population density is 32.05 inhabitants per square kilometre (83.0/sq mi). The municipality is unilingually Finnish. The medieval St. Olaf's Church is dedicated to St. Olaf, who also is portrayed in the arms of the municipality.
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