Unglaciated Allegheny Plateau

Fredericktown is a census-designated place located in East Bethlehem Township, Washington County in the state of Pennsylvania. The community was part of the Fredericktown-Millsboro CDP for the 2000 census, but was split into two separate CDPs for the 2010 census, the other community being Millsboro. Fredericktown is located in far southern Washington County, along Pennsylvania Route 88, which travels along the Monongahela River. As of the 2022 American Community Survey, the population was estimated to be 296.

Fredericktown-Millsboro was a census-designated place (CDP) in East Bethlehem Township, Washington County, Pennsylvania, United States. The population was 1,094 at the 2000 census. For the 2010 census the area was split into two CDPs, Fredericktown and Millsboro.

The Fredericktown Ferry (nicknamed Fred) is a cable driven ferry that operated on the Monongahela River in southwestern Pennsylvania about 30 miles south of Pittsburgh from 1948 until May, 2013. The ferry consisted of a 60-foot steel boat that could hold up to 6 vehicles at a time. It connected the village of Fredericktown in Washington County with the village of La Belle in Fayette County which are separated by the 400 feet (120 m) width of the river. The nearest bridge crossing is about 4 miles (6.4 km) north via the PA Turnpike 43. In 2013, the ferry cost $2 per motor vehicle and $0.50 per pedestrian, and was subsidized by Washington and Fayette Counties. The ferry service was discontinued due to low ridership and mounting financial deficits in 2013.

East Bethlehem Township is a township in Washington County, Pennsylvania, United States. The population was 2,309 at the 2020 census. The township contains the Frederickstown-Millsboro census-designated place.

North Fredericktown is an unincorporated community in Washington County, Pennsylvania, United States. It is home to the Horn Davis Overholtzer Bridge.

Aaronsburg is a census-designated place located in East Bethlehem Township, Washington County in the state of Pennsylvania. The community is located just to the north of Fredericktown along Pennsylvania Route 88 which travels along the Monongahela River. As of the 2010 census the population was 259 residents.

The Fayette State Correctional Institution is a 2,000 bed maximum-security prison located in a remote section of Fayette County, Pennsylvania, in the United States. The prison is located southeast of Pittsburgh and was built to replace two institutions (SCI-Waynesburg and SCI-Pittsburgh) to make the Commonwealth's prison system more energy-efficient. It is the only prison in the Commonwealth where Pennsylvania license plates are manufactured, holding that distinction since 2003.

The Regester Log House is an historic, American log house that is located in Fredericktown, Pennsylvania.

Millsboro is a census-designated place located in East Bethlehem Township, Washington County, Pennsylvania. The community was part of the Fredericktown-Millsboro CDP for the 2000 census but was split into two separate CDPs for the 2010 census, the other community being Fredericktown. Millsboro is located in far southern Washington County, along Pennsylvania Route 88, which travels along the Monongahela River. As of the 2010 census the population was 666 residents.

Tenmile Creek is a stream in Washington and Greene Counties, Pennsylvania, USA. It is a tributary of the Monongahela River.

Vestaburg is an unincorporated community in Washington County, Pennsylvania, United States. The community is located along Pennsylvania Route 88 and the Monongahela River, 2 miles (3.2 km) south of Centerville. Vestaburg has a post office, with ZIP code 15368, which opened on March 4, 1916.

East Millsboro is an unincorporated community in Fayette County, Pennsylvania, United States. The community is located on the east bank of the Monongahela River, across from Millsboro. East Millsboro has a post office with the ZIP code 15433.