Penobscot County is a county located in the U.S. state of Maine. As of the 2010 census, the population was 153,923. Its county seat is Bangor. The county was established on 15 February 1816 from a portion of Hancock County.
Penobscot County comprises the Bangor, ME Metropolitan Statistical Area.
The county is notable as being the setting of the 2002–2007 TV series The Dead Zone.