Siikainen was founded as a chapel of the Merikarvia mother parish in 1772, when the first church was completed. Siikainen was separated from Merikarvia as an independent parish by an imperial decree on 2 December 1861. The municipality of Siikainen was founded in 1871. The villages of Uusi- and Vanha-Samminmaja previously belonged to the municipality of Kankaanpää. Uusi-Samminmaja was annexed to the Siikainen parish in 1904. The old church of Siikainen burned down in 1887, and the current church, representing the neo-Gothic style, was built in 1889. The municipality is unilingually
Finnish. Siikainen hosts the
buddhist center Samje, and the
stupa located there was the northernmost in the world until 2016. ==References==