Äänekoski is a town in Finland, located in the Central Finland region, about 45 kilometres (28 mi) north of Jyväskylä, the region's capital city. Äänekoski has a population of 17,492, as of 31 December 2025, and covers an area of 1,138.39 square kilometres (439.53 sq mi) of which 253.84 km2 (98.01 sq mi), or 22%, is water. The population density is 19.77 inhabitants per square kilometre (51.2/sq mi).