Old Town is a city in Penobscot County, Maine, United States. The population was 7,431 at the 2020 census. The city's developed area is chiefly located on the relatively large Marsh Island, but its boundaries extend beyond it. The island is surrounded and defined by the Penobscot River to the east and the Stillwater River to the west.

Penobscot County is a county in the U.S. state of Maine, named for the Penobscot people in Wabanakik. As of the 2020 census, the population was 152,199, making it the third-most-populous county in Maine. Its county seat is Bangor. The county was established on February 15, 1816, from part of Hancock County when the area was still part of Massachusetts. Penobscot County is home to the University of Maine.