Many of the County Links on the left will keep you specifically in or near Penobscot County here in Maine. We add new listings and links on a regular basis so bookmark this page and check back often. Penobscot County was incorporated in 1816 and the county seat is Bangor. The Penobscot River, Maine’s longest, runs through the County. It is one of Maine’s largest counties, covering over 3,250 square miles. The County borders Piscataquis County on the West and Washington and Hancock Counties on the East. Bangor is home to many businesses and cultural centers, including the Maine Shakespeare Festival. Also, Orono, in Penobscot County, is home to the main campus of the University of Maine.