|• Municipal manager||Jukka Ollikainen|
|• Total||1,210.98 km2 (467.56 sq mi)|
|• Land||981.76 km2 (379.06 sq mi)|
|• Water||229.23 km2 (88.51 sq mi)|
|• Rank||79th largest in Finland|
|• Rank||157th largest in Finland|
|• Density||5.74/km2 (14.9/sq mi)|
|Population by native language|
|• Finnish||98.6% (official)|
|Population by age|
|• 0 to 14||11.2%|
|• 15 to 64||51.3%|
|• 65 or older||37.5%|
|Time zone||UTC+02:00 (EET)|
|• Summer (DST)||UTC+03:00 (EEST)|
|Municipal tax rate||20.75%|
It is located in the Southern Savonia region. The municipality has a population of 5,636 (31 December 2021) and covers an area of 1,210.98 square kilometres (467.56 sq mi) of which 229.23 km2 (88.51 sq mi) is water. The coastline is almost 1,520 kilometers (940 mi). The population density is 6.2 inhabitants per km².
The summer houses or cottages located in the countryside are part of the culture of Finland where most Finnish families spend their summer holidays. Mäntyharju is the municipality which has the fifth most summer houses in Finland. Some of the reasons for Mäntyharju's popularity involve its many pure lakes and a relatively short distance to the Finnish capital Helsinki of approximately 200 kilometres by car. The municipality also has a direct, high-speed train connection to the capital area. Because of the many summer houses, the population of Mäntyharju more than triples during the most popular summer holiday times.
Art Centre Salmela in Mäntyharju hosts one of Finland's largest cultural events in July–August.
The municipality is unilingually Finnish.
- "Area of Finnish Municipalities 1.1.2018" (PDF). National Land Survey of Finland. Retrieved 30 January 2018.
- "Preliminary population structure by area, 2021M01*-2021M12*". StatFin (in Finnish). Statistics Finland. Retrieved 2 February 2022.
- "Population according to language and the number of foreigners and land area km2 by area as of 31 December 2008". Statistics Finland's PX-Web databases. Statistics Finland. Retrieved 29 March 2009.
- "Population according to age (1-year) and sex by area and the regional division of each statistical reference year, 2003–2020". StatFin. Statistics Finland. Retrieved 2 May 2021.
- "List of municipal and parish tax rates in 2021" (PDF). Tax Administration of Finland. 1 December 2020. Retrieved 10 April 2021.
- Statistics Finland
Media related to Mäntyharju at Wikimedia Commons
- Municipality of Mäntyharju – Official site