Jämsä (in the local dialect, Jämpsä) is a town and municipality in Central Finland. It is 223 km from Helsinki, and 58 km from Jyväskylä. There were about 22,125 people living there in January 2014. Jämsä municipality was established in 1866. It is next to the municipalities of Juupajoki, Jyväskylä, Keuruu, Kuhmoinen, Luhanka, Mänttä-Vilppula, Orivesi and Petäjävesi. Isojärvi National Park, a popular hiking place, is near to Jämsä.
The former municipality of Kuorevesi was merged with Jämsä in 2001. The former municipality of Längelmäki was partly merged with Jämsä in 2007. The former municipality of Jämsänkoski was merged with Jämsä in 2009.
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