Marietta, Pennsylvania, is a small borough located in Lancaster County. It sits along the banks of the Susquehanna River and is known for its rich history and charming small-town atmosphere. Founded in the early 18th century, Marietta played a significant role in the Underground Railroad and has several historic buildings that reflect its past. The borough covers an area of approximately 0.5 square miles and has a population of around 2,500 residents. Marietta is part of the Lancaster Metropolitan Statistical Area and offers various recreational activities, including parks and access to the river for fishing and boating.