Russellton is a census-designated place (CDP) in Allegheny County, Pennsylvania, United States.

[3] According to the United States Census Bureau, the CDP has a total area of 1.4 square miles (3.7 km2), all land.

Russellton #1 was originally Grays Mill; the name changed about 1907.

[4] At the 2000 census, there were 1,530 people, 616 households, and 450 families living in the CDP.

There were 645 housing units at an average density of 449.1 per square mile (173.4/km2).