Isojoki

Isojoki (Storå in Swedish) is a municipality of Finland.

It is located in the province of Western Finland and is part of the Southern Ostrobothnia region. The municipality has a population of 2,619 (2003) and covers an area of 647.46 km² of which 4.81 km² is water. The population density is 4.0 inhabitants per km².

The municipality is unilingually Finnish.