Ostrobothnia County

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

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

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)