'''Jämijärvi''' is a municipality in the region of [[Region:Lounais-Suomi|Lounais-Suomi]]. It is located in the province of Western Finland and is part of the [[Satakunta]] region. The municipality has a population of 1,806 (31 January 2019) and covers an area of 224.34 square kilometres (86.62 sq mi) of which 9.99 km2 (3.86 sq mi) is water. The population density is 8.43 inhabitants per square kilometre (21.8/sq mi).