 Across the Monongahela River in Allegheny County to the north, Monongahela runs adjacent with Forward Township and has a direct connector via Monongahela Town Bridge.As of the census of 2000, there were 4,761 people, 2,139 households, and 1,264 families residing in the town.The population density was 2,472.4 people per square mile (952.5/km2).