Seinäjoki is a city located in Southern Ostrobothnia, Finland. Seinäjoki originated around the Östermyra bruk iron and gunpowder factories founded in 1798. Seinäjoki became a municipality in 1868, market town in 1931 and town in 1960. In 2005, the municipality of Peräseinäjoki was merged into Seinäjoki, and in the beginning of 2009, the neighbouring municipalities of Nurmo and Ylistaro were consolidated with Seinäjoki.