Lieto, or Lundo in Swedish, is a municipality of Finland.
It is located in the province of Western Finland and is part of the Finland Proper region. The municipality has a population of 15,002 (2004-12-31) and covers an area of 200.46 km² of which 1.27 km² is water. The population density is 75.32 inhabitants per km².
The municipality is unilingually Finnish.
Lieto has a medieval stone church that originates from around 1500 near the city centre.
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