Jefferson-Morgan Middle/Senior High School

Jefferson is a borough in Greene County, Pennsylvania, United States. The population was 253 at the 2020 census, a decline from the figure of 270 tabulated in 2010. The borough was named after Thomas Jefferson.

Hughes House is a historic home located at Jefferson Township in Greene County, Pennsylvania. It was built in 1814, and is a 2+1⁄2-story, three-bay, banked stone dwelling. It has a small, 1+1⁄2-story extension and a steeply pitched gable roof.It was listed on the National Register of Historic Places in 1972.

Browns Run is a small tributary to South Fork Tenmile Creek in southwestern Pennsylvania. The stream rises in northeastern Greene County and flows south-southeast entering South Fork Tenmile Creek at Mather, Pennsylvania. The watershed is roughly 31% agricultural, 61% forested and the rest is other uses.

The Mather Mine disaster refers to the events surrounding an explosion that occurred in the Mather Mine on May 19, 1928 at 4:07 PM in Mather, Pennsylvania. A report released by the United States Bureau of Mines states that a total of 195 men were killed in the catastrophe, of which two died in hospitals after being discovered by rescue crews and volunteers. The Mather Mine disaster ranks as the seventh worst mining disaster in U.S. history and the second worst in Pennsylvania history.

Mather is an unincorporated community and census-designated place in Morgan Township, Pennsylvania, United States. The community is located 1 mile (1.6 km) northwest of the borough of Jefferson, near Pennsylvania Route 188. It is 5 miles (8 km) northeast of Waynesburg, the Greene County seat. According to the 2010 census, the population of Mather was 737.

Colver-Rogers Farmstead, also known as the Norval P. Rogers building, is a historic building located at Morgan Township in Greene County, Pennsylvania. The original section was built in 1830, and is a two-story, stone dwelling, with a two-story stone wing, in a vernacular Greek Revival-style. The building was modified about 1906, with the addition of a gambrel roof and rambling porch with Colonial Revival-style design elements. Also on the property is a bank barn (c. 1880) and large wash house (c. 1906).It was listed on the National Register of Historic Places in 2003.

The John Rex Farm, also known as the Goodwin/Strickler Farm, is an historic American home and farm that are located in Jefferson Township in Greene County, Pennsylvania. It was listed on the National Register of Historic Places in 1998.

Castile Run is a small tributary to South Fork Tenmile Creek in southwestern Pennsylvania. The stream rises in northeastern Greene County and flows southeast entering South Fork Tenmile Creek at Chartiers, Pennsylvania. The watershed is roughly 25% agricultural, 69% forested and the rest is other uses.

William Cree House is a historic home located at Jefferson Township in Greene County, Pennsylvania. It was built in 1792, and is a two-story, three-bay, banked stone dwelling. A two-story, log house built in 1847, was moved and attached to the house about 1974. Also on the property is a banked stone spring house built in 1782.It was listed on the National Register of Historic Places in 2002.

Ruff Creek is a large tributary to South Fork Tenmile Creek in southwestern Pennsylvania. The stream rises in north-central Greene County and flows southeast entering South Fork Tenmile Creek northeast of Morrisville, Pennsylvania. The watershed is roughly 27% agricultural, 64% forested and the rest is other uses.

State Correctional Institution – Waynesburg was a Pennsylvania Department of Corrections minimum security prison in Morgan Township, Greene County, Pennsylvania near Waynesburg.The property had 117 acres (47 ha) of land. As a men's prison it had 220 employees and approximately 450 prisoners.

Clarksville is a borough in Greene County, Pennsylvania, United States. The population was 194 at the 2020 census.