Österbotten County, Österbottens län, or Pohjanmaan lääni, was a County of Sweden from 1634. In 1774 it was renamed Vasa County (Vasa län or Vaasan lääni) and Uleåborg County (Uleåborgs län/Oulun lääni) was split off. In 1808 when it was ceded to Russia. It was continued as an administrative entity of the Grand Duchy of Finland until 1917, and following this as a County of Finland until the large scale reorganization in 1997 when it was merged into the province of Western Finland.

List of Governors

• Johan Ehrenskiöld (1694-1706)
• Lorenz Clerck (1706-1720)
• Reinhold Wilhelm von Essen (1720-1732)
• Bror Rålamb (1733-1734)
• Carl Frölich (1734-1739)
• Gustaf Creutz (1739-1746)
• Gustaf Abraham Piper (1746-1761)
• Gustaf von Grooth (1761-1762)
• Carl Fredriksson Sparre (1763-1763)
• Fredrik Henrik Sparre (1763-1763)
• Lorenz Johan Giös (1763-1774)
  • Fredrik Magnus von Numers (acting 1774-1774)
• Bror Cederström (1775-1785)
• Adolf Tandefelt (1785-1794)
• Carl Fredrik Krabbe (1794-1805)
• Magnus Wanberg (1805-1808)
• Carl Constantin de Carnall (1808-1822)
• Anders Fabian Orrhjelm (acting 1812-1816)
• Herman Währnhjelm (1822-1830)
• Gustaf Magnus Armfelt (1830-1832)
• Carl Gustaf Mannerheim (1832-1834, acting until 1833)
• Carl Olof Cronstedt (1834-1845, acting until 1837)
• Jonas Ferdinand Bergenheim (1845-1847)
• Berndt Federley (1847-1854)
• Alexander von Rechenberg (1854-1858)
• Otto Leonard von Blom (1858-1861)
• Carl Gustaf Fabian Wrede (1862-1884, acting until 1863)
• Victor Napoleon Procopé (1884-1888)
  • Torsten Costiander (1885-1886)
• August Alexander Järnefelt (1888-1894)
• Fredrik Waldemar Schauman (1894-1898)
• Gustaf Axel von Kothen (1898-1900)
• Fredrik Geronimo Björnberg (1900-1903)
• Teodor Knipovitsch (1903-1905)
  • Fredrik Geronimo Björnberg (acting 1905-1906)
• Kasten de Pont (acting 1906-1910)
• Otto Bernhard Widnäs (1910-1912)
• Nikolai Sillman (1913-1916)
• Leo Aristides Sirelius (1916-1917)
  • Juho Torppa (acting 1917)
• Teodor Heikel (1917-1920)
• Bruno Sarlin (1920-1930)
• Kaarlo Martonen (1930-1938)
• Jalo Lahdensuo (1938-1943)
• Toivo Tarjanne (1943-1944)
• Gunnar Ahlbäck (1944-1967)
• Martti Viitanen (1967-1977)
• Antti Pohjonen (1977-1978)
• Mauno Kangasniemi (1978-1991)
• Tom Westergård (1991-1997)

See also: Österbotten, Oulu Province