Seinäjoki belonged to the church parish of Ilmajoki like Kurikka, Kauhajoki, Jalasjärvi and Alavus. However, in the 18th century the roads from Seinäjoki to the Church of Ilmajoki were generally in poor condition. Therefore, the inhabitants of Seinäjoki and the neighbouring Nurmo built a new chapel together in 1725, which in 1765 led to the formation of the chapel town of Nurmo. Seinäjoki, which was called Alaseinäjoki since the Greater Wrath, became a part of the chapel town. The chapel parish of Peräseinäjoki was founded in 1798, and the village of Alaseinäjoki began to be called Seinäjoki again. The very same year, the Östermyra steel mill was founded on the shore of the Seinäjoki river.