Washington Township is a township in Westmoreland County, Pennsylvania, United States. It was founded in 1789 from Salem Township. At that time, it included the present-day municipalities of Allegheny, Lower Burrell, Upper Burrell, and most of Bell. In 2020, the population of Washington Twp was 6,887.

Allegheny Township is a township in Westmoreland County, Pennsylvania, United States. The population was 8,316 at the 2020 census, an increase from 8,002 at the 2000 census. It is the northernmost municipality of Westmoreland County. The municipality borders the townships of Buffalo, Harrison, Upper Burrell, and Washington; and the boroughs of Oklahoma, Vandergrift, Leechburg, West Leechburg, Lower Burrell, Freeport and Hyde Park. It is served by the Kiski Area School District.