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The current (as of 2004[update]) population of Mäntymäki is 1,489, and it is decreasing at an annual rate of 0.34%. 10.28% of the district's population are under 15 years old, while 21.76% are over 65. The district's linguistic makeup is 90.33% Finnish, 6.85% Swedish, and 2.82% other.
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