Breadcrumb U.S. Presidents James K. Polk James K. Polk - Administration First LadySarah PolkVice PresidentGeorge M. Dallas (1845–1849)Secretary of StateJames Buchanan (1845–1849)Attorney GeneralIsaac Toucey (1848–1849)Attorney GeneralNathan Clifford (1846–1848)Attorney GeneralJohn Y. Mason (1845–1846)Postmaster GeneralCave Johnson (1845–1849)Secretary of the TreasuryRobert J. Walker (1845–1849)Secretary of the NavyJohn Y. Mason (1846–1849)Secretary of the NavyGeorge Bancroft (1845–1846)Secretary of WarWilliam L. Marcy (1845–1849)