Suodenniemi was first consolidated into Vammala in 2007. On 1 January 2009, Vammala itself was consolidated with Äetsä and Mouhijärvi to form the new named town of Sastamala.
The municipality had a population of 1,372 (2003) and covered an area of 220.83 square kilometres (85.26 sq mi) of which 13.20 square kilometres (5.10 sq mi) is water. The population density was 6.6 inhabitants per 1 square kilometre (0.39 sq mi).