Marietta is a borough in Lancaster County, Pennsylvania, United States. The population was 2,633 at the 2020 census. It is located on the east bank of the Susquehanna River, northwest of Columbia.

Columbia, formerly Wright's Ferry, is a borough (town) in Lancaster County, Pennsylvania, United States. As of the 2020 census, it had a population of 10,222. It is 28 miles (45 km) southeast of Harrisburg, on the east (left) bank of the Susquehanna River, across from Wrightsville and York County and just south of U.S. Route 30.