Of 16 counties in the Pine Tree State, Penobscot County is fourth in terms of its size (3,557 square miles). Penobscot County is in Northwest Maine. The total value of about 1,000 acres of ranches recently listed for sale in Maine's Penobscot County was approximately $1 million. Browse all Penobscot County ranches for sale on the Land Network to find the ranch that's right for your business or commercial needs, from the sprawling legacy ranch to unbelievable residential ranch for your second home, investment property or retirement nest egg. The most common type of land for sale by combined acreage in Penobscot County is residential property.