It is located in the province of Western Finland and is part of the Etelä-Pohjanmaa region. The municipality has a population of 3205 and covers an area of 310 km² of which 12 km² is water. The population density is 11 inhabitants per km².
The municipality is unilingual Finnish.
Töysä is known for its shopping village Tuuri and Veljekset Keskinen department store.