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Ostrobothnia County Österbottens län Pohjanmaan lääni
County of the Swedish Empire
1634–1775
Capital	Vaasa
History
•  Established	1634
• Disestablished	1775
Succeeded by Vaasa Province Oulu Province

Ostrobothnia County ( Swedish: Österbottens län, Finnish: Pohjanmaan lääni) was a county of the Swedish Empire from 1634 to 1775.

The county was split in 1755 to County of Vasa ( Swedish: Vasa län, Finnish: Vaasan lääni) and County of Uleåborg ( Swedish: Uleåborg län, Finnish: Oulun lääni).

Maps

Governors

• Melcher Wernstedt 1635–1642
• Hans Kyle 1642–1648 (Vasa County)
• Erik Soop 1644–1648 (Uleåborg County)
• Hans Kyle 1648–1650
• Ture Svensson Ribbing 1650–1654
• Johan Graan 1654–1668
• Jacob Duwall 1668–1669
• Johan Graan 1669–1674
• Didrik Wrangel af Adinal 1674–1685
• Gustaf Grass 1685–1694
• Johan Nilsson Ehrenskiöldh 1694–1706
• Johan Stiernstedt 1706 (acting)
• Lorentz Clerk 1706–1720
• Reinhold Wilhelm von Essen 1720–1732
• Carl Henrik Wrangel af Adinal 1732
• Broor Rålamb 1733–1734
• Carl Frölich 1734–1739
• Gustaf Creutz 1739–1746
• Gustaf Abraham Piper 1746–1761
• Gustaf von Grooth 1761–1762
• Carl Sparre 1763
• Fredrik Henrik Sparre 1763
• Lorentz Johan Göös 1763–1774
• Fredrik Magnus von Numers 1774 (acting)