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The former Oulu Province in Finland was divided on two regions, nine sub-regions and 43 municipalities.

• Oulu sub-region
  • Hailuoto (Karlö)
  • Haukipudas
  • Kempele
  • Kiiminki (Kiminge)
  • Liminka (Limingo)
  • Lumijoki
  • Muhos
  • Oulu (Uleåborg)
  • Oulunsalo
  • Tyrnävä
• Oulunkaari sub-region
  • Ii (Ijo)
  • Pudasjärvi
  • Utajärvi
  • Yli-Ii

• Raahe sub-region
  • Pyhäjoki
  • Raahe (Brahestad)
  • Siikajoki
  • Vihanti
• Siikalatva sub-region
  • Haapavesi
  • Pyhäntä
  • Siikalatva
• Nivala–Haapajärvi sub-region
  • Haapajärvi
  • Kärsämäki
  • Nivala
  • Pyhäjärvi
  • Reisjärvi
• Ylivieska sub-region
  • Alavieska
  • Kalajoki
  • Merijärvi
  • Oulainen
  • Sievi
  • Ylivieska
• Koillismaa sub-region
  • Kuusamo
  • Taivalkoski

• Kehys-Kainuu sub-region
  • Hyrynsalmi (8)
  • Kuhmo (6)
  • Puolanka (9)
  • Suomussalmi (7)
• Kajaani sub-region
  • Kajaani (Kajana) (1)
  • Paltamo (3)
  • Ristijärvi (4)
  • Sotkamo (5)
  • Vaala (2)

• Municipalities of Northern Ostrobothnia
• Municipalities of Kainuu