Siikajoki is a municipality of Finland. It is part of the North Ostrobothnia region. The municipality has a population of 4,779
(31 August 2024) and covers an area of 1,653.89 square kilometres (638.57 sq mi) of
which 601.94 km2 (232.41 sq mi)
is water. The population density is
4.53 inhabitants per square kilometre (11.7/sq mi). Neighbour municipalities are Hailuoto, Liminka, Lumijoki, Raahe and Siikalatva.
The municipality is unilingually Finnish.
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