My MITCHELL family lived in Carmel, ME.
Grandfather - Rossell (1889-1972)
Gr-grandfather - Phineas (1866-1963)
Gr-gr-grandfather was William (1817-1898)
William first appears in 1843 in Bangor, ME when he purchases land for $200.
Married May 31, 1844 in Bangor, ME to Rocinda FARRAR
And after that I can easily track him.
According to William's death certificate he was born in Livermore, ME to Thomas Mitchell & Elizabeth Rana (as spelled)... I can find no birth record for him nor anything about his parents..
Have tried to make a connection to Livermore. Found a Melzer Mitchell (wife Phebe Parker) 1820 census, Livermore. 1810 census in Leeds. 1830-1840 census in Minot. Born 1780 (maybe Freeport?), married in Cumberland, died in 1846, and buried in Mechanic Falls.... It is probably a false connection but throwing it out there due to the Livermore connection.