Saarijärvi is a town and municipality of Finland located in the Central Finland region. The municipality has a population of 8,837, as of 31 …Saarijärvi is a town and municipality of Finland located in the Central Finland region. The municipality has a population of 8,837, as of 31 October 2024, and covers an area of 1,422.72 square kilometres of which 170.8 km², or 12%, is water. The population density is 7.06 inhabitants per square kilometre.