Waldo County 027 Belfast 1827 From parts of Hancock County, Kennebec County and Lincoln County Samuel Waldo , a colonial soldier in the siege of Louisbourg in 1745. &&&&&&&&&&036280.&&&&&0 36,280 &&&&&&&&&&&&0853.&&&&&0 853 sq mi ( &&&&&&&&&&&02209.&&&&&0 2,209 km 2 ) Washington County 029 Machias 1790 As Washington County, Massachusetts from part of Lincoln County