Orono is a town in Penobscot County, Maine, United States. It was first settled in 1774 and named in honor of Chief Joseph Orono of the Penobscot Nation. It is home to The University of Maine. According to the United States Census Bureau, the town has a total area of 19.8 square miles (51.2 km²), of which, 18.2 square miles (47.2 km²) of it is land and 1.6 square miles (4.1 km²) of it is water. The total area is 7.94% water. The town is divided by the Stillwater River, a branch of the Penobscot River, with part occupying part of Marsh Island, which is surrounded by the Penobscot and the Stillwater, and the other part on the mainland.