Ellsworth is a borough in Washington County, Pennsylvania, United States. The population was 1,027 at the 2010 census. The coal town was founded by James Ellsworth who bought up the land in 1890s, developed the Monongahela Railway, and sold the mines to Bethlehem Steel in the 1920s.
Ellsworth is located at 40°6′21″N 80°1′14″W (40.105887, -80.020455).
According to the United States Census Bureau, the borough has a total area of 0.8 square miles (2.1 km2), of which, 0.7 square miles (1.8 km2) of it is land and 0.04 square miles (0.10 km2) of it (2.63%) is water.
At the 2000 census there were 1,083 people, 484 households, and 291 families living in the borough. The population density was 1,467.7 people per square mile (565.1/km²). There were 528 housing units at an average density of 715.6 per square mile (275.5/km²). The racial makeup of the borough was 96.03% White, 2.31% African American, 0.09% Asian, 0.09% from other races, and 1.48% from two or more races. Hispanic or Latino of any race were 0.65%.
Of the 484 households 23.8% had children under the age of 18 living with them, 44.8% were married couples living together, 12.2% had a female householder with no husband present, and 39.7% were non-families. 36.8% of households were one person and 20.7% were one person aged 65 or older. The average household size was 2.22 and the average family size was 2.91.